15939 has 24 divisors (see below), whose sum is σ = 29952. Its totient is φ = 7920.

The previous prime is 15937. The next prime is 15959. The reversal of 15939 is 93951.

15939 = 27² + 28² + ... + 40².

15939 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15939 - 2¹ = 15937 is a prime.

15939 is a lucky number.

It is a nialpdrome in base 7.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 15939.

It is not an unprimeable number, because it can be changed into a prime (15937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 682 + ... + 704.

It is an arithmetic number, because the mean of its divisors is an integer number (1248).

2¹⁵⁹³⁹ is an apocalyptic number.

15939 is a deficient number, since it is larger than the sum of its proper divisors (14013).

15939 is a wasteful number, since it uses less digits than its factorization.

15939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47 (or 44 counting only the distinct ones).

The product of its digits is 1215, while the sum is 27.

The square root of 15939 is about 126.2497524750. The cubic root of 15939 is about 25.1663572222.

The spelling of 15939 in words is "fifteen thousand, nine hundred thirty-nine".