31900312 has 16 divisors (see below), whose sum is σ = 59877360. Its totient is φ = 15933024.

The previous prime is 31900307. The next prime is 31900321. The reversal of 31900312 is 21300913.

It is a self number, because there is not a number n which added to its sum of digits gives 31900312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9478 + ... + 12394.

It is an arithmetic number, because the mean of its divisors is an integer number (3742335).

Almost surely, 2^31900312 is an apocalyptic number.

It is an amenable number.

31900312 is a deficient number, since it is larger than the sum of its proper divisors (27977048).

31900312 is a wasteful number, since it uses less digits than its factorization.

31900312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4290 (or 4286 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 31900312 is about 5648.0361188647. The cubic root of 31900312 is about 317.1501907163.

The spelling of 31900312 in words is "thirty-one million, nine hundred thousand, three hundred twelve".