31297812 has 48 divisors (see below), whose sum is σ = 89884032. Its totient is φ = 8254080.

The previous prime is 31297781. The next prime is 31297837. The reversal of 31297812 is 21879213.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13239 + ... + 15422.

It is an arithmetic number, because the mean of its divisors is an integer number (1872584).

Almost surely, 2^31297812 is an apocalyptic number.

It is an amenable number.

31297812 is an abundant number, since it is smaller than the sum of its proper divisors (58586220).

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

31297812 is a wasteful number, since it uses less digits than its factorization.

31297812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28688 (or 28686 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 31297812 is about 5594.4447445658. Note that the first 3 decimals coincide. The cubic root of 31297812 is about 315.1408188726.

The spelling of 31297812 in words is "thirty-one million, two hundred ninety-seven thousand, eight hundred twelve".