315643940 has 24 divisors (see below), whose sum is σ = 663458040. Its totient is φ = 126142208.

The previous prime is 315643883. The next prime is 315643943. The reversal of 315643940 is 49346513.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 132204004 + 183439936 = 11498^2 + 13544^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 315643940.

It is not an unprimeable number, because it can be changed into a prime (315643943) 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, 17246 + ... + 30474.

It is an arithmetic number, because the mean of its divisors is an integer number (27644085).

Almost surely, 2^315643940 is an apocalyptic number.

It is an amenable number.

315643940 is an abundant number, since it is smaller than the sum of its proper divisors (347814100).

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

315643940 is a wasteful number, since it uses less digits than its factorization.

315643940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14431 (or 14429 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 315643940 is about 17766.3710419433. The cubic root of 315643940 is about 680.8725390959.

The spelling of 315643940 in words is "three hundred fifteen million, six hundred forty-three thousand, nine hundred forty".