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38 (number)

Natural number From Wikipedia, the free encyclopedia

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

Quick Facts ← 37 38 39 →, Cardinal ...
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In mathematics

  • 38! − 1 yields 523022617466601111760007224100074291199999999 which is the 16th factorial prime.[1]
  • There is no answer to the equation φ(x) = 38, making 38 a nontotient.[2]
  • 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.[3]
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In science

Astronomy

In other fields

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Ishihara test: 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

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