12639964 has 6 divisors (see below), whose sum is σ = 22119944. Its totient is φ = 6319980.

The previous prime is 12639961. The next prime is 12639989. The reversal of 12639964 is 46993621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12639961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1579992 + ... + 1579999.

Almost surely, 2^12639964 is an apocalyptic number.

It is an amenable number.

12639964 is a deficient number, since it is larger than the sum of its proper divisors (9479980).

12639964 is a wasteful number, since it uses less digits than its factorization.

12639964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3159995 (or 3159993 counting only the distinct ones).

The product of its digits is 69984, while the sum is 40.

The square root of 12639964 is about 3555.2727040271. The cubic root of 12639964 is about 232.9424357540.

The spelling of 12639964 in words is "twelve million, six hundred thirty-nine thousand, nine hundred sixty-four".