12664539 has 16 divisors (see below), whose sum is σ = 18865440. Its totient is φ = 8396640.

The previous prime is 12664537. The next prime is 12664543. The reversal of 12664539 is 93546621.

It is a happy number.

12664539 is a `hidden beast` number, since 1 + 2 + 6 + 645 + 3 + 9 = 666.

It is not a de Polignac number, because 12664539 - 2¹ = 12664537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12664537) 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, 4129 + ... + 6509.

It is an arithmetic number, because the mean of its divisors is an integer number (1179090).

Almost surely, 2^12664539 is an apocalyptic number.

12664539 is a deficient number, since it is larger than the sum of its proper divisors (6200901).

12664539 is a wasteful number, since it uses less digits than its factorization.

12664539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2587 (or 2581 counting only the distinct ones).

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

The square root of 12664539 is about 3558.7271600953. The cubic root of 12664539 is about 233.0933025974.

It can be divided in two parts, 12664 and 539, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 12664539 in words is "twelve million, six hundred sixty-four thousand, five hundred thirty-nine".