312918820 has 12 divisors (see below), whose sum is σ = 657129564. Its totient is φ = 125167520.

The previous prime is 312918817. The next prime is 312918821. The reversal of 312918820 is 28819213.

It can be written as a sum of positive squares in 2 ways, for example, as 87198244 + 225720576 = 9338^2 + 15024^2 .

It is not an unprimeable number, because it can be changed into a prime (312918821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7822951 + ... + 7822990.

It is an arithmetic number, because the mean of its divisors is an integer number (54760797).

Almost surely, 2^312918820 is an apocalyptic number.

It is an amenable number.

312918820 is an abundant number, since it is smaller than the sum of its proper divisors (344210744).

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

312918820 is a wasteful number, since it uses less digits than its factorization.

312918820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15645950 (or 15645948 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 312918820 is about 17689.5115817255. The cubic root of 312918820 is about 678.9074294514.

The spelling of 312918820 in words is "three hundred twelve million, nine hundred eighteen thousand, eight hundred twenty".