31930900 has 36 divisors (see below), whose sum is σ = 72307872. Its totient is φ = 12216160.

The previous prime is 31930883. The next prime is 31930937. The reversal of 31930900 is 903913.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 4642 + ... + 9241.

It is an arithmetic number, because the mean of its divisors is an integer number (2008552).

Almost surely, 2^31930900 is an apocalyptic number.

It is an amenable number.

31930900 is an abundant number, since it is smaller than the sum of its proper divisors (40376972).

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

31930900 is a wasteful number, since it uses less digits than its factorization.

31930900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13920 (or 13913 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 25.

The square root of 31930900 is about 5650.7433139367. The cubic root of 31930900 is about 317.2515260997.

The spelling of 31930900 in words is "thirty-one million, nine hundred thirty thousand, nine hundred".