38 (Number)

38 is the natural number following 37 and preceding 39.
Cardinal thirty-eight
Ordinal38th (thirty-eighth)
Factorization2\cdot 19
Roman numeralXXXVIII
Binary100110
Hexadecimal26
38! - 1 yields 523022617466601111760007224100074291199999999, which is a factorial prime. There is no answer to the equation φ(x) = 38, making 38 a nontotient. 38 is the sum of the squares of the first three primes. 37 and 38 are the first pair of consecutive positive integers not divisible by any of their digits.

In science

In astronomy,
Messier object M38, a magnitude 7.0 open cluster in the constellation Auriga
The New General Catalogue object NGC 38, a spiral galaxy in the constellation Pisces
The Saros number of the solar eclipse series which began on -1729 June 26 and ended on -431 August 14. The duration of Saros series 38 was 1298.1 years, and it contained 73 solar eclipses.
The Saros number of the lunar eclipse series which began on -1408 April 16 and ended on -111 June 3. The duration of Saros series 38 was 1298.1 years, and it contained 73 lunar eclipses.
Thirty-eight is also:
   

 

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