312439690 has 16 divisors (see below), whose sum is σ = 562700520. Its totient is φ = 124907200.

The previous prime is 312439663. The next prime is 312439697. The reversal of 312439690 is 96934213.

It can be written as a sum of positive squares in 4 ways, for example, as 131079601 + 181360089 = 11449^2 + 13467^2 .

It is a super-2 number, since 2×312439690² = 195237119774592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (312439697) 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, 13140 + ... + 28240.

Almost surely, 2^312439690 is an apocalyptic number.

312439690 is a deficient number, since it is larger than the sum of its proper divisors (250260830).

312439690 is a wasteful number, since it uses less digits than its factorization.

312439690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17177.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 312439690 is about 17675.9636229542. The cubic root of 312439690 is about 678.5607462663.

The spelling of 312439690 in words is "three hundred twelve million, four hundred thirty-nine thousand, six hundred ninety".