312399387 has 12 divisors (see below), whose sum is σ = 474993480. Its totient is φ = 197304768.

The previous prime is 312399371. The next prime is 312399389. The reversal of 312399387 is 783993213.

312399387 is a `hidden beast` number, since 31 + 239 + 9 + 387 = 666.

It is not a de Polignac number, because 312399387 - 2⁴ = 312399371 is a prime.

It is a super-3 number, since 3×312399387³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (312399389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 913278 + ... + 913619.

It is an arithmetic number, because the mean of its divisors is an integer number (39582790).

Almost surely, 2^312399387 is an apocalyptic number.

312399387 is a deficient number, since it is larger than the sum of its proper divisors (162594093).

312399387 is a wasteful number, since it uses less digits than its factorization.

312399387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826922 (or 1826919 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 312399387 is about 17674.8235351870. The cubic root of 312399387 is about 678.5315681448.

The spelling of 312399387 in words is "three hundred twelve million, three hundred ninety-nine thousand, three hundred eighty-seven".