12539664 has 40 divisors (see below), whose sum is σ = 35994720. Its totient is φ = 4179744.

The previous prime is 12539663. The next prime is 12539701. The reversal of 12539664 is 46693521.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (12539663) 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 in 7 ways as a sum of consecutive naturals, for example, 14082 + ... + 14945.

It is an arithmetic number, because the mean of its divisors is an integer number (899868).

Almost surely, 2^12539664 is an apocalyptic number.

It is an amenable number.

12539664 is an abundant number, since it is smaller than the sum of its proper divisors (23455056).

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

12539664 is a wasteful number, since it uses less digits than its factorization.

12539664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29044 (or 29032 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 12539664 is about 3541.1387998778. The cubic root of 12539664 is about 232.3246544727.

It can be divided in two parts, 12539 and 664, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 12539664 in words is "twelve million, five hundred thirty-nine thousand, six hundred sixty-four".