397130918 has 16 divisors (see below), whose sum is σ = 612126720. Its totient is φ = 193140936.

The previous prime is 397130917. The next prime is 397130933. The reversal of 397130918 is 819031793.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397130911) 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, 2363 + ... + 28281.

It is an arithmetic number, because the mean of its divisors is an integer number (38257920).

Almost surely, 2^397130918 is an apocalyptic number.

397130918 is a deficient number, since it is larger than the sum of its proper divisors (214995802).

397130918 is a wasteful number, since it uses less digits than its factorization.

397130918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26131.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 397130918 is about 19928.1438674052. The cubic root of 397130918 is about 735.0404395662.

The spelling of 397130918 in words is "three hundred ninety-seven million, one hundred thirty thousand, nine hundred eighteen".