12931720 has 32 divisors (see below), whose sum is σ = 29364120. Its totient is φ = 5125120.

The previous prime is 12931669. The next prime is 12931739. The reversal of 12931720 is 2713921.

It can be written as a sum of positive squares in 4 ways, for example, as 6791236 + 6140484 = 2606^2 + 2478^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3090 + ... + 5950.

Almost surely, 2^12931720 is an apocalyptic number.

12931720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12931720 is an abundant number, since it is smaller than the sum of its proper divisors (16432400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12931720 is a wasteful number, since it uses less digits than its factorization.

12931720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985 (or 2981 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 12931720 is about 3596.0700771815. The cubic root of 12931720 is about 234.7210814899.

The spelling of 12931720 in words is "twelve million, nine hundred thirty-one thousand, seven hundred twenty".