12939864 has 32 divisors (see below), whose sum is σ = 36971520. Its totient is φ = 3697056.

The previous prime is 12939859. The next prime is 12939889. The reversal of 12939864 is 46893921.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38344 + ... + 38679.

It is an arithmetic number, because the mean of its divisors is an integer number (1155360).

Almost surely, 2^12939864 is an apocalyptic number.

12939864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

12939864 is an abundant number, since it is smaller than the sum of its proper divisors (24031656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12939864 is a wasteful number, since it uses less digits than its factorization.

12939864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77039 (or 77035 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 12939864 is about 3597.2022461908. The cubic root of 12939864 is about 234.7703445255.

It can be divided in two parts, 129 and 39864, that added together give a palindrome (39993).

The spelling of 12939864 in words is "twelve million, nine hundred thirty-nine thousand, eight hundred sixty-four".