12939431 has 16 divisors (see below), whose sum is σ = 14496768. Its totient is φ = 11491200.

The previous prime is 12939391. The next prime is 12939449. The reversal of 12939431 is 13493921.

12939431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12939431 - 2¹⁴ = 12923047 is a prime.

It is a super-2 number, since 2×12939431² = 334857749207522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12939491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22376 + ... + 22946.

It is an arithmetic number, because the mean of its divisors is an integer number (906048).

Almost surely, 2^12939431 is an apocalyptic number.

12939431 is a deficient number, since it is larger than the sum of its proper divisors (1557337).

12939431 is a wasteful number, since it uses less digits than its factorization.

12939431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662.

The product of its digits is 5832, while the sum is 32.

The square root of 12939431 is about 3597.1420600249. The cubic root of 12939431 is about 234.7677258299.

The spelling of 12939431 in words is "twelve million, nine hundred thirty-nine thousand, four hundred thirty-one".