38 (number)
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38 is the natural number following 37 and preceding 39.
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| Cardinal | thirty-eight | ||
| Ordinal | 38th (thirty-eighth) | ||
| Factorization | <math>2\cdot 19<math> | ||
| Roman numeral | XXXVIII | ||
| Binary | 100110 | ||
| Hexadecimal | 26 | ||
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 astronomy
- The Messier object M38, a magnitude 7.0 open cluster in the constellation Auriga
- 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 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.
- The New General Catalogue object NGC 38, a spiral galaxy in the constellation Pisces
- The 38th parallel north is pre-Korean War boundary between North Korea and South Korea.
In other fields
Thirty-eight is also:
- The atomic number of strontium
- The number of slots on an American Roulette wheel.
- The number of games that each team in the current English Premiership, the top division in English Association Football, plays in a season
- Bill C-38 could legalize gay marriage in Canada.
- The year A.D. 38, 38 BC, or 1938.
eo:Tridek ok fr:38 (nombre) ko:38 ia:38 it:Trentotto nl:38 (getal) ja:38 no:38 (tall) pt:Trinta e oito sl:38 (število) sv:38 (tal) zh:38