12779931 has 16 divisors (see below), whose sum is σ = 17521920. Its totient is φ = 8282400.

The previous prime is 12779917. The next prime is 12779939. The reversal of 12779931 is 13997721.

It is not a de Polignac number, because 12779931 - 2¹⁴ = 12763547 is a prime.

It is a super-2 number, since 2×12779931² = 326653272729522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12779931.

It is not an unprimeable number, because it can be changed into a prime (12779939) 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, 17881 + ... + 18581.

It is an arithmetic number, because the mean of its divisors is an integer number (1095120).

Almost surely, 2^12779931 is an apocalyptic number.

12779931 is a deficient number, since it is larger than the sum of its proper divisors (4741989).

12779931 is a wasteful number, since it uses less digits than its factorization.

12779931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866.

The product of its digits is 23814, while the sum is 39.

The square root of 12779931 is about 3574.9029357452. The cubic root of 12779931 is about 233.7991007075.

The spelling of 12779931 in words is "twelve million, seven hundred seventy-nine thousand, nine hundred thirty-one".