315991394 has 16 divisors (see below), whose sum is σ = 499361280. Its totient is φ = 149551920.

The previous prime is 315991381. The next prime is 315991409. The reversal of 315991394 is 493199513.

It is a super-2 number, since 2×315991394² = 199701122164126472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 53072 + ... + 58724.

It is an arithmetic number, because the mean of its divisors is an integer number (31210080).

Almost surely, 2^315991394 is an apocalyptic number.

315991394 is a deficient number, since it is larger than the sum of its proper divisors (183369886).

315991394 is a wasteful number, since it uses less digits than its factorization.

315991394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7145.

The product of its digits is 131220, while the sum is 44.

The square root of 315991394 is about 17776.1467703212. The cubic root of 315991394 is about 681.1222773884.

The spelling of 315991394 in words is "three hundred fifteen million, nine hundred ninety-one thousand, three hundred ninety-four".