315391232 has 72 divisors (see below), whose sum is σ = 685667976. Its totient is φ = 143917056.

The previous prime is 315391187. The next prime is 315391243. The reversal of 315391232 is 232193513.

It can be written as a sum of positive squares in 4 ways, for example, as 56310016 + 259081216 = 7504^2 + 16096^2 .

It is a junction number, because it is equal to n+sod(n) for n = 315391195 and 315391204.

It is a congruent 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, 322328 + ... + 323304.

Almost surely, 2^315391232 is an apocalyptic number.

315391232 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 315391232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342833988).

315391232 is an abundant number, since it is smaller than the sum of its proper divisors (370276744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

315391232 is an equidigital number, since it uses as much as digits as its factorization.

315391232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103 (or 1089 counting only the distinct ones).

The product of its digits is 4860, while the sum is 29.

The square root of 315391232 is about 17759.2576421426. The cubic root of 315391232 is about 680.6907859087.

The spelling of 315391232 in words is "three hundred fifteen million, three hundred ninety-one thousand, two hundred thirty-two".