312990915 has 16 divisors (see below), whose sum is σ = 502653600. Its totient is φ = 166305792.

The previous prime is 312990913. The next prime is 312990947. The reversal of 312990915 is 519099213.

It is not a de Polignac number, because 312990915 - 2¹ = 312990913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (312990913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34750 + ... + 42819.

It is an arithmetic number, because the mean of its divisors is an integer number (31415850).

Almost surely, 2^312990915 is an apocalyptic number.

312990915 is a deficient number, since it is larger than the sum of its proper divisors (189662685).

312990915 is a wasteful number, since it uses less digits than its factorization.

312990915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77846.

The product of its (nonzero) digits is 21870, while the sum is 39.

The square root of 312990915 is about 17691.5492538104. The cubic root of 312990915 is about 678.9595644563.

The spelling of 312990915 in words is "three hundred twelve million, nine hundred ninety thousand, nine hundred fifteen".