12939645 has 16 divisors (see below), whose sum is σ = 20799360. Its totient is φ = 6869184.

The previous prime is 12939637. The next prime is 12939653. The reversal of 12939645 is 54693921.

It is an interprime number because it is at equal distance from previous prime (12939637) and next prime (12939653).

It is not a de Polignac number, because 12939645 - 2³ = 12939637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1552 + ... + 5318.

It is an arithmetic number, because the mean of its divisors is an integer number (1299960).

Almost surely, 2^12939645 is an apocalyptic number.

12939645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12939645 is a deficient number, since it is larger than the sum of its proper divisors (7859715).

12939645 is a wasteful number, since it uses less digits than its factorization.

12939645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004.

The product of its digits is 58320, while the sum is 39.

The square root of 12939645 is about 3597.1718057385. The cubic root of 12939645 is about 234.7690200655.

It can be divided in two parts, 12939 and 645, that multiplied together give a triangular number (8345655 = T₄₀₈₅).

The spelling of 12939645 in words is "twelve million, nine hundred thirty-nine thousand, six hundred forty-five".