900 (number)

{{Infobox number

| number = 900

| divisor = 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 25, 30, 36, 45, 50, 60, 75, 90, 100, 150, 180, 225, 300, 450, 900

|lang1=Armenian|lang1 symbol=Ջ|lang2=Hebrew|lang2 symbol=תת"ק / ץ|lang3=Babylonian cuneiform|lang3 symbol=𒌋𒐙|lang4=Egyptian hieroglyph|lang4 symbol=𓍪}}

900 (nine hundred) is the natural number following 899 and preceding 901. It is the square of 30 and the sum of Euler's totient function for the first 54 positive integers. In base 10, it is a Harshad number. It is also the first number to be the square of a sphenic number.

In other fields

900 is also:

A telephone area code for "premium" telephone calls in the North American Numbering Plan (900 number){{Cite web|date=2011-02-11|title=Pay-Per-Call Information Services|url=https://www.fcc.gov/consumers/guides/faqs-900-number-pay-call-services-and-fees|access-date=2021-03-31|website=Federal Communications Commission|language=en}}
In Greek number symbols, the sign Sampi ("ϡ", literally "like a pi")
A skateboarding trick in which the skateboarder spins two and a half times (360 degrees times 2.5 is 900)
A 900 series refers to three consecutive perfect games in bowling{{Cite web|date=2016-01-13|title=Bowler throws 36 consecutive strikes for incredible 900 series|url=https://ftw.usatoday.com/2016/01/bowler-throws-36-consecutive-strikes-for-incredible-900-series|access-date=2021-03-31|website=For The Win|language=en-US}}
Yoda's age in Star Wars{{Cite web |last=Sawan |first=Amer |date=2024-06-14 |title=How Old is Yoda in The Phantom Menace? |url=https://www.cbr.com/star-wars-yoda-age/ |access-date=2025-04-19 |website=CBR |language=en}}

Integers from 901 to 999

=900s=

901 = 17 × 53, centered triangular number, happy number
902 = 2 × 11 × 41, sphenic number, nontotient, Harshad number
903 = 3 × 7 × 43, sphenic number, 42nd triangular number,{{Cite web|url=https://oeis.org/A000217|title=Sloane's A000217: Triangular numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} Schröder–Hipparchus number, Mertens function(903) returns 0, little Schroeder number
904 = 2³ × 113 or 113 × 8, refactorable number, Mertens function(904) returns 0, lazy caterer number, number of 1's in all partitions of 26 into odd parts{{cite OEIS|A036469|Partial sums of A000009 (partitions into distinct parts)}}
905 = 5 × 181, sum of seven consecutive primes (109 + 113 + 127 + 131 + 137 + 139 + 149), smallest composite de Polignac number{{Cite web|url=https://oeis.org/A098237|title=Sloane's A098237: Composite de Polignac numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2022-05-10}}
"The 905" is a common nickname for the suburban portions of the Greater Toronto Area in Canada, a region whose telephones used area code 905 before overlay plans added two more area codes.
906 = 2 × 3 × 151, strobogrammatic, sphenic number, Mertens function(906) returns 0
907 = prime number
908 = 2² × 227, nontotient, number of primitive sorting networks on 6 elements,{{cite OEIS|A006245|Number of primitive sorting networks on n elements; also number of rhombic tilings of a 2n-gon|access-date=2022-05-24}} number of rhombic tilings of a 12-gon
909 = 3² × 101, number of non-isomorphic aperiodic multiset partitions of weight 7 {{cite OEIS|A303546|Number of non-isomorphic aperiodic multiset partitions of weight n|access-date=2022-05-24}}

=910s=

910 = 2 × 5 × 7 × 13, Mertens function(910) returns 0, Harshad number, happy number, balanced number,{{cite OEIS|A020492|Balanced numbers: numbers k such that phi(k) (A000010) divides sigma(k) (A000203)}} number of polynomial symmetric functions of matrix of order 7 under separate row and column permutations{{cite OEIS|A007716|Number of polynomial symmetric functions of matrix of order n under separate row and column permutations}}
911 = Sophie Germain prime number, also the emergency telephone number in North America
912 = 2⁴ × 3 × 19, sum of four consecutive primes (223 + 227 + 229 + 233), sum of ten consecutive primes (71 + 73 + 79 + 83 + 89 + 97 + 101 + 103 + 107 + 109), Harshad number.
913 = 11 × 83, Smith number,{{Cite web|url=https://oeis.org/A006753|title=Sloane's A006753 : Smith numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} Mertens function(913) returns 0.
914 = 2 × 457, nontotient, number of compositions of 11 that are neither weakly increasing nor weakly decreasing {{cite OEIS|A332834|Number of compositions of n that are neither weakly increasing nor weakly decreasing|access-date=2022-05-23}}
915 = 3 × 5 × 61, sphenic number, Smith number, Mertens function(915) returns 0, Harshad number
916 = 2² × 229, Mertens function(916) returns 0, nontotient, strobogrammatic, member of the Mian–Chowla sequence{{Cite web|url=https://oeis.org/A005282|title=Sloane's A005282 : Mian-Chowla sequence|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}}
917 = 7 × 131, sum of five consecutive primes (173 + 179 + 181 + 191 + 193)
918 = 2 × 3³ × 17, Harshad number
919 = prime number, cuban prime,{{Cite web|url=https://oeis.org/A002407|title=Sloane's A002407 : Cuban primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} prime index prime, Chen prime, palindromic prime, centered hexagonal number,{{Cite web|url=https://oeis.org/A003215|title=Sloane's A003215 : Hex (or centered hexagonal) numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} Mertens function(919) returns 0

=920s=

920 = 2³ × 5 × 23, Mertens function(920) returns 0, total number of nodes in all rooted trees with 8 nodes {{cite OEIS|A055544|Total number of nodes in all rooted trees with n nodes|access-date=2022-05-23}}
921 = 3 × 307, number of enriched r-trees of size 7 {{cite OEIS|A301462|Number of enriched r-trees of size n|access-date=2022-05-23}}
922 = 2 × 461, nontotient, Smith number
923 = 13 × 71, number of combinations of 6 things from 1 to 6 at a time {{cite OEIS|A030662|Number of combinations of n things from 1 to n at a time, with repeats allowed|access-date=2022-05-23}}
924 = 2² × 3 × 7 × 11, sum of a twin prime (461 + 463), central binomial coefficient $\tbinom {12} 6$ {{Cite web|url=https://oeis.org/A000984|title=Sloane's A000984 : Central binomial coefficients|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}}
925 = 5² × 37, pentagonal number,{{Cite web|url=https://oeis.org/A000326|title=Sloane's A000326 : Pentagonal numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} centered square number{{Cite web|url=https://oeis.org/A001844|title=Sloane's A001844 : Centered square numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}}
The millesimal fineness number for Sterling silver
926 = 2 × 463, sum of six consecutive primes (139 + 149 + 151 + 157 + 163 + 167), nontotient
927 = 3² × 103, tribonacci number{{Cite web|url=https://oeis.org/A000073|title=Sloane's A000073 : Tribonacci numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}}
928 = 2⁵ × 29, sum of four consecutive primes (227 + 229 + 233 + 239), sum of eight consecutive primes (101 + 103 + 107 + 109 + 113 + 127 + 131 + 137), happy number
929 = prime number, Proth prime,{{Cite web|url=https://oeis.org/A080076|title=Sloane's A080076 : Proth primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} palindromic prime, sum of nine consecutive primes (83 + 89 + 97 + 101 + 103 + 107 + 109 + 113 + 127), Eisenstein prime with no imaginary part
An area code in New York.

=930s=

930 = 2 × 3 × 5 × 31, pronic number{{Cite web|url=https://oeis.org/A002378|title=Sloane's A002378 : Oblong (or promic, pronic, or heteromecic) numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}}
931 = 7² × 19; sum of three consecutive primes (307 + 311 + 313); double repdigit, 111₃₀ and 777₁₁; number of regular simple graphs spanning 7 vertices {{cite OEIS|A319612|Number of regular simple graphs spanning n vertices|access-date=2022-05-23}}
932 = 2² × 233, number of regular simple graphs on 7 labeled nodes {{cite OEIS|A295193|Number of regular simple graphs on n labeled nodes|access-date=2022-05-22}}
933 = 3 × 311
934 = 2 × 467, nontotient
935 = 5 × 11 × 17, sphenic number, Lucas–Carmichael number,{{Cite web|url=https://oeis.org/A006972|title=Sloane's A006972 : Lucas-Carmichael numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} Harshad number
936 = 2³ × 3² × 13, pentagonal pyramidal number,{{Cite web|url=https://oeis.org/A002411|title=Sloane's A002411 : Pentagonal pyramidal numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} Harshad number
937 = prime number, Chen prime, star number,{{Cite web|url=https://oeis.org/A003154|title=Sloane's A003154 : Centered 12-gonal numbers. Also star numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} happy number
938 = 2 × 7 × 67, sphenic number, nontotient, number of lines through at least 2 points of an 8 × 8 grid of points {{cite OEIS|A018808|Number of lines through at least 2 points of an n X n grid of points|access-date=2022-05-22}}
939 = 3 × 313, number of V-toothpicks after 31 rounds of the honeycomb sequence {{cite OEIS|A161206|V-toothpick (or honeycomb) sequence}}

=940s=

940 = 2² × 5 × 47, totient sum for first 55 integers
941 = prime number, sum of three consecutive primes (311 + 313 + 317), sum of five consecutive primes (179 + 181 + 191 + 193 + 197), Chen prime, Eisenstein prime with no imaginary part
942 = 2 × 3 × 157, sphenic number, sum of four consecutive primes (229 + 233 + 239 + 241), nontotient, convolved Fibonacci number {{cite OEIS|A001628|Convolved Fibonacci numbers}}
943 = 23 × 41
944 = 2⁴ × 59, nontotient, Lehmer-Comtet number{{cite OEIS|A005727|n-th derivative of x^x at x=1. Also called Lehmer-Comtet numbers}}
945 = 3³ × 5 × 7, double factorial of 9,{{Cite web|url=https://oeis.org/A006882|title=Sloane's A006882 : Double factorials|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} smallest odd abundant number (proper divisors add up to more than 975);{{cite book |title=Number Story: From Counting to Cryptography |url=https://archive.org/details/numberstoryfromc00higg_612 |url-access=limited |last=Higgins |first=Peter |year=2008 |publisher=Copernicus |location=New York |isbn=978-1-84800-000-1 |page=[https://archive.org/details/numberstoryfromc00higg_612/page/n22 13] }} smallest odd primitive abundant number;{{Cite web|url=https://oeis.org/A006038|title=Sloane's A006038 : Odd primitive abundant numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} smallest odd primitive semiperfect number;{{Cite web|url=https://oeis.org/A006036|title=Sloane's A006036 : Primitive pseudoperfect numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} Leyland number{{Cite web|url=https://oeis.org/A076980|title=Sloane's A076980 : Leyland numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}}
946 = 2 × 11 × 43, sphenic number, 43rd triangular number, hexagonal number,{{Cite web|url=https://oeis.org/A000384|title=Sloane's A000384 : Hexagonal numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} happy number
947 = prime number, sum of seven consecutive primes (113 + 127 + 131 + 137 + 139 + 149 + 151), balanced prime,{{Cite web|url=https://oeis.org/A006562|title=Sloane's A006562 : Balanced primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} Chen prime, lazy caterer number, Eisenstein prime with no imaginary part
948 = 2² × 3 × 79, nontotient, forms a Ruth–Aaron pair with 949 under second definition, number of combinatory separations of normal multisets of weight 6.{{cite OEIS|A269134|Number of combinatory separations of normal multisets of weight n|access-date=2022-05-13}}
949 = 13 × 73, forms a Ruth–Aaron pair with 948 under second definition

=950s=

950 = 2 × 5² × 19, nontotient, generalized pentagonal number{{Cite OEIS|1=A001318|2=Generalized pentagonal numbers|access-date=2016-06-11}}
one of two ISBN Group Identifiers for books published in Argentina
951 = 3 × 317, centered pentagonal number{{Cite web|url=https://oeis.org/A005891|title=Sloane's A005891 : Centered pentagonal numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}}
one of two ISBN Group Identifiers for books published in Finland
952 = 2³ × 7 × 17, number of reduced words of length 3 in the Weyl group D_17,{{Cite OEIS|A162328|Number of reduced words of length n in the Weyl group D_17|access-date=2022-05-12}} number of regions in regular tetradecagon with all diagonals drawn. {{Cite OEIS|A007678|Number of regions in regular n-gon with all diagonals drawn. |access-date=2022-05-13}}
952 is also 9-5-2, a card game similar to bridge.
one of two ISBN Group Identifiers for books published in Finland
953 = prime number, Sophie Germain prime,{{Cite web|url=https://oeis.org/A005384|title=Sloane's A005384 : Sophie Germain primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} Chen prime, Eisenstein prime with no imaginary part, centered heptagonal number{{Cite web|url=https://oeis.org/A069099|title=Sloane's A069099 : Centered heptagonal numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}}
ISBN Group Identifier for books published in Croatia
954 = 2 × 3² × 53, sum of ten consecutive primes (73 + 79 + 83 + 89 + 97 + 101 + 103 + 107 + 109 + 113), nontotient, Harshad number, sixth derivative of x^(x^x) at x=1.{{Cite OEIS|A179230|sixth derivative of x^(x^x) at x=1|access-date=2022-05-12}}
ISBN Group Identifier for books published in Bulgaria. Also one of the Area Codes in the South Florida Area
955 = 5 × 191, number of transitive rooted trees with 17 nodes
ISBN Group Identifier for books published in Sri Lanka
956 = 2² × 239, number of compositions of 13 into powers of 2.{{OEIS|A023359|Number of compositions of n into powers of 2|access-date=2022-05-11}}
ISBN Group Identifier for books published in Chile
957 = 3 × 11 × 29, sphenic number, antisigma(45){{Cite OEIS|A024816|Antisigma(n): Sum of the numbers less than n that do not divide n|access-date=2016-05-11}}
one of two ISBN Group Identifiers for books published in Taiwan and China
958 = 2 × 479, nontotient, Smith number
ISBN Group Identifier for books published in Colombia
The millesimal fineness number for Britannia silver
959 = 7 × 137, composite de Polignac number{{Cite web|url=https://oeis.org/A098237|title=Sloane's A098237: Composite de Polignac numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2022-05-10}}
ISBN Group Identifier for books published in Cuba

=960s=

960 = 2⁶ × 3 × 5, sum of six consecutive primes (149 + 151 + 157 + 163 + 167 + 173), Harshad number
country calling code for Maldives, ISBN Group Identifier for books published in Greece
The number of possible starting positions for the chess variant Chess960
961 = 31², the largest 3-digit perfect square, sum of three consecutive primes (313 + 317 + 331), sum of five consecutive primes (181 + 191 + 193 + 197 + 199), centered octagonal number{{Cite web|url=https://oeis.org/A016754|title=Sloane's A016754 : Odd squares: a(n) = (2n+1)^2. Also centered octagonal numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}}
country calling code for Lebanon, ISBN Group Identifier for books published in Slovenia
962 = 2 × 13 × 37, sphenic number, nontotient
country calling code for Jordan, one of two ISBN Group Identifiers for books published in Hong Kong
963 = 3² × 107, sum of the first twenty-four primes
country calling code for Syria, ISBN Group Identifier for books published in Hungary
964 = 2² × 241, sum of four consecutive primes (233 + 239 + 241 + 251), nontotient, totient sum for first 56 integers
country calling code for Iraq, ISBN Group Identifier for books published in Iran, happy number
965 = 5 × 193
country calling code for Kuwait, ISBN Group Identifier for books published in Israel
966 = 2 × 3 × 7 × 23 = $\left\{ {8 \atop 3} \right\}$ , sum of eight consecutive primes (103 + 107 + 109 + 113 + 127 + 131 + 137 + 139), Harshad number
country calling code for Saudi Arabia, one of two ISBN Group Identifiers for books published in Ukraine
967 = prime number, prime index prime
country calling code for Yemen, one of two ISBN Group Identifiers for books published in Malaysia
968 = 2³ × 11², nontotient, Achilles number, area of a square with diagonal 44{{cite OEIS|A001105|a(n) = 2*n^2}}
country calling code for Oman, one of two ISBN Group Identifiers for books published in Mexico
969 = 3 × 17 × 19, sphenic number, nonagonal number,{{Cite web|url=https://oeis.org/A001106|title=Sloane's A001106 : 9-gonal (or enneagonal or nonagonal) numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} tetrahedral number{{Cite web|url=https://oeis.org/A000292|title=Sloane's A000292 : Tetrahedral numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}}
ISBN Group Identifier for books published in Pakistan, age of Methuselah according to Old Testament, anti-Muslim movement in Myanmar

=970s=

970 = 2 × 5 × 97, sphenic number, heptagonal number
country calling code for Palestinian territories, one of two ISBN Group Identifiers for books published in Mexico
971 = prime number, Chen prime, Eisenstein prime with no imaginary part
country calling code for United Arab Emirates, ISBN Group Identifier for books published in the Philippines
972 = 2² × 3⁵, Harshad number, Achilles number
country calling code for Israel, one of two ISBN Group Identifiers for books published in Portugal
The Sum of Anti-Factors of 972 = number * (n/2) where n is an Odd number. So, it is a Hemi-Anti-Perfect Number. Other such Numbers include 2692, etc.

972 has Anti-Factors = 5, 8, 24, 29, 67, 72, 216, 389, 648

Sum of Anti-Factors = 5 + 8 + 24 + 29 + 67 + 72 + 216 + 389 + 648 = 1458 = 972 * 3/2

973 = 7 × 139, happy number
country calling code for Bahrain, ISBN Group Identifier for books published in Romania,
974 = 2 × 487, nontotient, 974! - 1 is prime{{Cite web|url=https://oeis.org/A002982|title=A002982: Numbers n such that n! - 1 is prime.|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2022-05-10}}
country calling code for Qatar, ISBN Group Identifier for books published in Thailand
975 = 3 × 5² × 13
country calling code for Bhutan, ISBN Group Identifier for books published in Turkey
976 = 2⁴ × 61, decagonal number{{Cite web|url=https://oeis.org/A001107|title=Sloane's A001107 : 10-gonal (or decagonal) numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}}
country calling code for Mongolia, ISBN Group Identifier for books published in Antigua, Bahamas, Barbados, Belize, Cayman Islands, Dominica, Grenada, Guyana, Jamaica, Montserrat, Saint Kitts and Nevis, St. Lucia, St. Vincent and the Grenadines, Trinidad and Tobago, and the British Virgin Islands
977 = prime number, sum of nine consecutive primes (89 + 97 + 101 + 103 + 107 + 109 + 113 + 127 + 131), balanced prime, Chen prime, Eisenstein prime with no imaginary part, Stern prime,{{Cite web|url=https://oeis.org/A042978|title=Sloane's A042978 : Stern primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} strictly non-palindromic number{{Cite web|url=https://oeis.org/A016038|title=Sloane's A016038 : Strictly non-palindromic numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}}
country calling code for Nepal
EAN prefix for ISSNs
ISBN Group Identifier for books published in Egypt
978 = 2 × 3 × 163, sphenic number, nontotient, number of secondary structures of RNA molecules with 11 nucleotides{{cite OEIS|A004148|Generalized Catalan numbers}}
First EAN prefix for ISBNs
ISBN Group Identifier for books published in Nigeria
979 = 11 × 89, the sum of the five smallest fourth powers: $979=\sum_{n=1}^{5}n^4$
Second EAN prefix for ISBNs. Also for ISMNs
ISBN Group Identifier for books published in Indonesia

=980s=

980 = 2² × 5 × 7², number of ways to tile a hexagon of edge 3 with [https://www.cs.utexas.edu/users/EWD/transcriptions/EWD10xx/EWD1055.html calissons] of side 1.{{Cite web|url=https://oeis.org/A008793|title=A008793|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2022-05-10}}
ISBN Group Identifier for books published in Venezuela
981 = 3² × 109
one of two ISBN Group Identifiers for books published in Singapore
982 = 2 × 491, happy number
ISBN Group Identifier for books published in the Cook Islands, Fiji, Kiribati, Marshall Islands, Micronesia, Nauru, New Caledonia, Niue, Palau, Solomon Islands, Tokelau, Tonga, Tuvalu, Vanuatu, Western Samoa
983 = prime number, safe prime,{{Cite web|url=https://oeis.org/A005385|title=Sloane's A005385 : Safe primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} Chen prime, Eisenstein prime with no imaginary part, Wedderburn–Etherington number,{{Cite web|url=https://oeis.org/A001190|title=Sloane's A001190 : Wedderburn-Etherington numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} strictly non-palindromic number
One of two ISBN Group Identifiers for books published in Malaysia
984 = 2³ × 3 × 41
ISBN Group Identifier for books published in Bangladesh
985 = 5 × 197, sum of three consecutive primes (317 + 331 + 337), Markov number,{{Cite web|url=https://oeis.org/A002559|title=Sloane's A002559 : Markoff (or Markov) numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} Pell number,{{Cite web|url=https://oeis.org/A000129|title=Sloane's A000129 : Pell numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} Smith number
one of two ISBN Group Identifiers for books published in Belarus
986 = 2 × 17 × 29, sphenic number, nontotient, strobogrammatic, number of unimodal compositions of 14 where the maximal part appears once{{cite OEIS|A006330|Number of corners, or planar partitions of n with only one row and one column}}
one of two ISBN Group Identifiers for books published in Taiwan and China
987 = 3 × 7 × 47, sphenic number, Fibonacci number,{{Cite web|url=https://oeis.org/A000045|title=Sloane's A000045 : Fibonacci numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}} number of partitions of 52 into prime parts
one of two ISBN Group Identifiers for books published in Argentina
988 = 2² × 13 × 19, nontotient. sum of four consecutive primes (239 + 241 + 251 + 257). A cake number.
one of two ISBN Group Identifiers for books published in Hong Kong.
989 = 23 × 43, Extra strong Lucas pseudoprime{{Cite web|url=https://oeis.org/A217719|title=Sloane's A0217719 : Extra strong Lucas pseudoprimes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-11}}
one of two ISBN Group Identifiers for books published in Portugal

=990s=

990 = 2 × 3² × 5 × 11, sum of six consecutive primes (151 + 157 + 163 + 167 + 173 + 179), 44th triangular number, Harshad number
best possible VantageScore credit score
991 = prime number, sum of five consecutive primes (191 + 193 + 197 + 199 + 211), sum of seven consecutive primes (127 + 131 + 137 + 139 + 149 + 151 + 157), Chen prime, lucky prime, prime index prime
992 = 2⁵ × 31, pronic number, nontotient; number of eleven-dimensional exotic spheres.{{cite web|url=http://math.ucr.edu/home/baez/week164.html |title=week164 |publisher=Math.ucr.edu |date=2001-01-13 |access-date=2014-05-12}}
country calling code for Tajikistan
993 = 3 × 331
country calling code for Turkmenistan
994 = 2 × 7 × 71, sphenic number, nontotient, number of binary words of length 13 with all distinct runs.{{cite web|title=A351016|url=https://oeis.org/A351016|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2022-05-10}}
country calling code for Azerbaijan
995 = 5 × 199
country calling code for Georgia
Singapore fire brigade and emergency ambulance services hotline, Brunei Darussalam fire service emergency number
996 = 2² × 3 × 83
country calling code for Kyrgyzstan
997 = largest three-digit prime number, strictly non-palindromic number. It is also a lucky prime.
998 = 2 × 499, nontotient, number of 7-node graphs with two connected components.{{cite web|title=A275165|url=https://oeis.org/A275165|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2022-05-10}}
country calling code for Uzbekistan

999 = 3³ × 37, Kaprekar number,{{cite web|title=Sloane's A006886 : Kaprekar numbers|url=https://oeis.org/A006886|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-06-02}} Harshad number
In some parts of the world, such as the UK and Commonwealth countries, 999 (pronounced as nine, nine, nine) is the emergency telephone number for all emergency services
999 was a London punk band active during the 1970s.
A number commonly associated with Juice WRLD

References

Category:Integers