12708639 has 12 divisors (see below), whose sum is σ = 19436976. Its totient is φ = 7973952.

The previous prime is 12708629. The next prime is 12708671. The reversal of 12708639 is 93680721.

12708639 is a `hidden beast` number, since 12 + 7 + 0 + 8 + 639 = 666.

It is not a de Polignac number, because 12708639 - 2⁴ = 12708623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12708629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41379 + ... + 41684.

It is an arithmetic number, because the mean of its divisors is an integer number (1619748).

Almost surely, 2^12708639 is an apocalyptic number.

12708639 is a deficient number, since it is larger than the sum of its proper divisors (6728337).

12708639 is a wasteful number, since it uses less digits than its factorization.

12708639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83086 (or 83083 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 12708639 is about 3564.9178111143. The cubic root of 12708639 is about 233.3635455210.

The spelling of 12708639 in words is "twelve million, seven hundred eight thousand, six hundred thirty-nine".