397130660 has 12 divisors (see below), whose sum is σ = 833974428. Its totient is φ = 158852256.

The previous prime is 397130623. The next prime is 397130663. The reversal of 397130660 is 66031793.

It can be written as a sum of positive squares in 2 ways, for example, as 144384256 + 252746404 = 12016^2 + 15898^2 .

It is a super-2 number, since 2×397130660² = 315425522224071200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 397130660.

It is not an unprimeable number, because it can be changed into a prime (397130663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9928247 + ... + 9928286.

It is an arithmetic number, because the mean of its divisors is an integer number (69497869).

Almost surely, 2^397130660 is an apocalyptic number.

It is an amenable number.

397130660 is an abundant number, since it is smaller than the sum of its proper divisors (436843768).

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

397130660 is a wasteful number, since it uses less digits than its factorization.

397130660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19856542 (or 19856540 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 35.

The square root of 397130660 is about 19928.1373941470. The cubic root of 397130660 is about 735.0402803908.

The spelling of 397130660 in words is "three hundred ninety-seven million, one hundred thirty thousand, six hundred sixty".