12939931 has 4 divisors (see below), whose sum is σ = 13621000. Its totient is φ = 12258864.

The previous prime is 12939929. The next prime is 12939937. The reversal of 12939931 is 13993921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12939931 - 2¹ = 12939929 is a prime.

It is a super-2 number, since 2×12939931² = 334883628569522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12939937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340506 + ... + 340543.

It is an arithmetic number, because the mean of its divisors is an integer number (3405250).

Almost surely, 2^12939931 is an apocalyptic number.

12939931 is a deficient number, since it is larger than the sum of its proper divisors (681069).

12939931 is an equidigital number, since it uses as much as digits as its factorization.

12939931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681068.

The product of its digits is 13122, while the sum is 37.

The square root of 12939931 is about 3597.2115589718. The cubic root of 12939931 is about 234.7707497226.

The spelling of 12939931 in words is "twelve million, nine hundred thirty-nine thousand, nine hundred thirty-one".