312291812 has 24 divisors (see below), whose sum is σ = 625504320. Its totient is φ = 133642080.

The previous prime is 312291787. The next prime is 312291821. The reversal of 312291812 is 218192213.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11987 + ... + 27717.

It is an arithmetic number, because the mean of its divisors is an integer number (26062680).

Almost surely, 2^312291812 is an apocalyptic number.

It is an amenable number.

312291812 is an abundant number, since it is smaller than the sum of its proper divisors (313212508).

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

312291812 is a wasteful number, since it uses less digits than its factorization.

312291812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16451 (or 16449 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 312291812 is about 17671.7801027514. The cubic root of 312291812 is about 678.4536748918.

The spelling of 312291812 in words is "three hundred twelve million, two hundred ninety-one thousand, eight hundred twelve".