31912940 has 12 divisors (see below), whose sum is σ = 67017216. Its totient is φ = 12765168.

The previous prime is 31912939. The next prime is 31912967. The reversal of 31912940 is 4921913.

It is a happy number.

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, 797804 + ... + 797843.

It is an arithmetic number, because the mean of its divisors is an integer number (5584768).

Almost surely, 2^31912940 is an apocalyptic number.

It is an amenable number.

31912940 is an abundant number, since it is smaller than the sum of its proper divisors (35104276).

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

31912940 is a wasteful number, since it uses less digits than its factorization.

31912940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595656 (or 1595654 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 31912940 is about 5649.1539189510. The cubic root of 31912940 is about 317.1920340297.

The spelling of 31912940 in words is "thirty-one million, nine hundred twelve thousand, nine hundred forty".