12638979 has 24 divisors (see below), whose sum is σ = 19094400. Its totient is φ = 8046720.

The previous prime is 12638957. The next prime is 12638987. The reversal of 12638979 is 97983621.

12638979 is a `hidden beast` number, since 1 + 2 + 638 + 9 + 7 + 9 = 666.

12638979 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 12638979 - 2¹¹ = 12636931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12638909) 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, 24577 + ... + 25085.

It is an arithmetic number, because the mean of its divisors is an integer number (795600).

Almost surely, 2^12638979 is an apocalyptic number.

12638979 is a deficient number, since it is larger than the sum of its proper divisors (6455421).

12638979 is a wasteful number, since it uses less digits than its factorization.

12638979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 632 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 12638979 is about 3555.1341746831. The cubic root of 12638979 is about 232.9363847279.

The spelling of 12638979 in words is "twelve million, six hundred thirty-eight thousand, nine hundred seventy-nine".