12539957 has 4 divisors (see below), whose sum is σ = 12548256. Its totient is φ = 12531660.

The previous prime is 12539951. The next prime is 12539987. The reversal of 12539957 is 75993521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 75993521 = 19 ⋅3999659.

It is a cyclic number.

It is not a de Polignac number, because 12539957 - 2⁶ = 12539893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12539951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1169 + ... + 5142.

It is an arithmetic number, because the mean of its divisors is an integer number (3137064).

Almost surely, 2^12539957 is an apocalyptic number.

It is an amenable number.

12539957 is a deficient number, since it is larger than the sum of its proper divisors (8299).

12539957 is an equidigital number, since it uses as much as digits as its factorization.

12539957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8298.

The product of its digits is 85050, while the sum is 41.

The square root of 12539957 is about 3541.1801705081. The cubic root of 12539957 is about 232.3264639468.

The spelling of 12539957 in words is "twelve million, five hundred thirty-nine thousand, nine hundred fifty-seven".