12857931 has 24 divisors (see below), whose sum is σ = 19206720. Its totient is φ = 8284416.

The previous prime is 12857909. The next prime is 12857941. The reversal of 12857931 is 13975821.

It is not a de Polignac number, because 12857931 - 2¹¹ = 12855883 is a prime.

It is a super-2 number, since 2×12857931² = 330652779201522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

Its product of digits (15120) is a multiple of the sum of its prime divisors (432).

It is not an unprimeable number, because it can be changed into a prime (12857941) 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, 47665 + ... + 47933.

It is an arithmetic number, because the mean of its divisors is an integer number (800280).

Almost surely, 2^12857931 is an apocalyptic number.

12857931 is a deficient number, since it is larger than the sum of its proper divisors (6348789).

12857931 is a wasteful number, since it uses less digits than its factorization.

12857931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 432 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 12857931 is about 3585.7957275896. The cubic root of 12857931 is about 234.2737864845.

It can be divided in two parts, 1285 and 7931, that added together give a square (9216 = 96²).

The spelling of 12857931 in words is "twelve million, eight hundred fifty-seven thousand, nine hundred thirty-one".