31980940 has 12 divisors (see below), whose sum is σ = 67160016. Its totient is φ = 12792368.

The previous prime is 31980919. The next prime is 31980959. The reversal of 31980940 is 4908913.

It is a junction number, because it is equal to n+sod(n) for n = 31980896 and 31980905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 799504 + ... + 799543.

It is an arithmetic number, because the mean of its divisors is an integer number (5596668).

Almost surely, 2^31980940 is an apocalyptic number.

It is an amenable number.

31980940 is an abundant number, since it is smaller than the sum of its proper divisors (35179076).

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

31980940 is a wasteful number, since it uses less digits than its factorization.

31980940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1599056 (or 1599054 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 31980940 is about 5655.1693166518. The cubic root of 31980940 is about 317.4171648247.

The spelling of 31980940 in words is "thirty-one million, nine hundred eighty thousand, nine hundred forty".