39 (number)
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| Cardinal | thirty-nine | ||
| Ordinal | 39th (thirty-ninth) | ||
| Factorization | <math>3\cdot 13<math> | ||
| Roman numeral | XXXIX | ||
| Binary | 100111 | ||
| Hexadecimal | 27 | ||
39 is the natural number following 38 and preceding 40.
In mathematics
Thirty-nine is the sum of five consecutive primes (3 + 5 + 7 + 11 + 13) and the sum of the first three powers of 3 (<math>3^1 + 3^2 + 3^3<math>). Given 39, the Mertens function returns 0.
In astronomy
- Messier object M39, a magnitude 5.5 open cluster in the constellation Cygnus
- The New General Catalogue object NGC 39, a spiral galaxy in the constellation Andromeda
- The Saros number of the
- solar eclipse series which began on -1718 May 26 and ended on -438 July 3. The duration of Saros series 39 was 1280.1 years, and it contained 72 solar eclipses.
- lunar eclipse series which began on -1380 March 26 and ended on -82 May 14. The duration of Saros series 39 was 1298.1 years, and it contained 73 lunar eclipses.
In other fields
Thirty-nine is also:
- The atomic number of yttrium
- In the title of the John Buchan novel, The Thirty-Nine Steps.
- The code for international direct-dialed phone calls to Italy.
- I-39 is the designation for a US interstate highway from Normal, Illinois to Wausau, Wisconsin.
- The eternal age of comedian Jack Benny, and many other people as they grow older.
- The traditional number of times citizens of Ancient Rome hit their slaves when beating them, referred to as "Forty save one."
- Japanese Internet chat slang for "thank you" when written with numbers.
- The year A.D. 39, 39 BC, or 1939.es:Treinta y nueve
eo:Tridek naŭ ko:39 ia:39 it:Trentanove nl:39 (getal) ja:39 pt:Trinta e nove sl:39 (število) sv:39 (tal) zh:39