315657938 has 18 divisors (see below), whose sum is σ = 503658981. Its totient is φ = 148343904.

The previous prime is 315657907. The next prime is 315657941. The reversal of 315657938 is 839756513.

It can be written as a sum of positive squares in 2 ways, for example, as 288898009 + 26759929 = 16997^2 + 5173^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=12563.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315657892 and 315657901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 426773 + ... + 427511.

Almost surely, 2^315657938 is an apocalyptic number.

315657938 is a deficient number, since it is larger than the sum of its proper divisors (188001043).

315657938 is an frugal number, since it uses more digits than its factorization.

315657938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514 (or 758 counting only the distinct ones).

The product of its digits is 680400, while the sum is 47.

The square root of 315657938 is about 17766.7649840932. The cubic root of 315657938 is about 680.8826039313.

The spelling of 315657938 in words is "three hundred fifteen million, six hundred fifty-seven thousand, nine hundred thirty-eight".