12639539 has 6 divisors (see below), whose sum is σ = 13893180. Its totient is φ = 11490380.

The previous prime is 12639527. The next prime is 12639547. The reversal of 12639539 is 93593621.

12639539 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12639539 - 2⁸ = 12639283 is a prime.

It is a super-2 number, since 2×12639539² = 319515892265042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12639559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52109 + ... + 52350.

It is an arithmetic number, because the mean of its divisors is an integer number (2315530).

Almost surely, 2^12639539 is an apocalyptic number.

12639539 is a deficient number, since it is larger than the sum of its proper divisors (1253641).

12639539 is a wasteful number, since it uses less digits than its factorization.

12639539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104481 (or 104470 counting only the distinct ones).

The product of its digits is 43740, while the sum is 38.

The square root of 12639539 is about 3555.2129331448. The cubic root of 12639539 is about 232.9398249437.

The spelling of 12639539 in words is "twelve million, six hundred thirty-nine thousand, five hundred thirty-nine".