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38 (number)

{{Refimprove|date=August 2009}}

{{Infobox number

| number = 38

| divisor = 1, 2, 19, 38

}}

38 (thirty-eight) is the natural number following 37 and preceding 39.

In mathematics

  • 38! − 1 yields {{val|523022617466601111760007224100074291199999999}} which is the 16th factorial prime.{{Cite OEIS|1=A002982|2=Numbers n such that n! - 1 is prime|access-date=2016-05-31}}
  • There is no answer to the equation φ(x) = 38, making 38 a nontotient.{{OEIS|id=A005277}}
  • 37 and 38 are the first pair of consecutive positive integers not divisible by any of their digits.
  • 38 is the largest even number which cannot be written as the sum of two odd composite numbers.
  • The sum of each row of the only non-trivial (order 3) magic hexagon is 38.{{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/n62 53] }}

In science

=Astronomy=

In other fields

Image:ColorBlindTest38.png: Most people will see the number 38, but people with red-green color blindness might see 88 instead.]]

Thirty-eight is also:

See also

References

{{reflist}}

{{Integers|zero}}

Category:Integers