Today is 39 day of the year.

39 = 3 x 13.

39 = 3 + 5 + 7 + 11 + 13, the sum of five consecutive primes, the sum of all the primes between the two factors.

39 is a member of two primitive, Pythagorean triples (39, 80, 89) and (39, 760, 761).

39 is member of the sequence that remains after applying Flavius Josephus' sieve.

39 is the smallest number to have a multiplicative persistence of three.

3 x 9 = 27

2 x 7 = 14

1 x 4 = 4

39 is a member of the delightfully self-referential Aronson's sequence.

39 is a member of the delightfully silly Iccanobif numbers.

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