31806312 has 16 divisors (see below), whose sum is σ = 79515840. Its totient is φ = 10602096.

The previous prime is 31806311. The next prime is 31806349. The reversal of 31806312 is 21360813.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 1325263 = 31806312 / (3 + 1 + 8 + 0 + 6 + 3 + 1 + 2).

It is not an unprimeable number, because it can be changed into a prime (31806311) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 662608 + ... + 662655.

It is an arithmetic number, because the mean of its divisors is an integer number (4969740).

Almost surely, 2^31806312 is an apocalyptic number.

It is an amenable number.

31806312 is an abundant number, since it is smaller than the sum of its proper divisors (47709528).

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

31806312 is a wasteful number, since it uses less digits than its factorization.

31806312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325272 (or 1325268 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 31806312 is about 5639.7085031055. The cubic root of 31806312 is about 316.8383709007.

The spelling of 31806312 in words is "thirty-one million, eight hundred six thousand, three hundred twelve".