312981988 has 24 divisors (see below), whose sum is σ = 602459424. Its totient is φ = 142262120.

The previous prime is 312981979. The next prime is 312981989. The reversal of 312981988 is 889189213.

It is not an unprimeable number, because it can be changed into a prime (312981989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24070 + ... + 34717.

It is an arithmetic number, because the mean of its divisors is an integer number (25102476).

Almost surely, 2^312981988 is an apocalyptic number.

It is an amenable number.

312981988 is a deficient number, since it is larger than the sum of its proper divisors (289477436).

312981988 is a wasteful number, since it uses less digits than its factorization.

312981988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58824 (or 58800 counting only the distinct ones).

The product of its digits is 248832, while the sum is 49.

The square root of 312981988 is about 17691.2969564133. The cubic root of 312981988 is about 678.9531093918.

The spelling of 312981988 in words is "three hundred twelve million, nine hundred eighty-one thousand, nine hundred eighty-eight".