12939731 has 16 divisors (see below), whose sum is σ = 15552000. Its totient is φ = 10526208.

The previous prime is 12939727. The next prime is 12939739. The reversal of 12939731 is 13793921.

It is not a de Polignac number, because 12939731 - 2² = 12939727 is a prime.

It is a super-2 number, since 2×12939731² = 334873276704722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12939691 and 12939700.

It is not an unprimeable number, because it can be changed into a prime (12939739) 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 15 ways as a sum of consecutive naturals, for example, 28595 + ... + 29043.

It is an arithmetic number, because the mean of its divisors is an integer number (972000).

Almost surely, 2^12939731 is an apocalyptic number.

12939731 is a deficient number, since it is larger than the sum of its proper divisors (2612269).

12939731 is a wasteful number, since it uses less digits than its factorization.

12939731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658.

The product of its digits is 10206, while the sum is 35.

The square root of 12939731 is about 3597.1837595541. The cubic root of 12939731 is about 234.7695401749.

The spelling of 12939731 in words is "twelve million, nine hundred thirty-nine thousand, seven hundred thirty-one".