397139568 has 40 divisors (see below), whose sum is σ = 1172508288. Its totient is φ = 113468352.

The previous prime is 397139563. The next prime is 397139569. The reversal of 397139568 is 865931793.

It is a self number, because there is not a number n which added to its sum of digits gives 397139568.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397139563) 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, 590646 + ... + 591317.

Almost surely, 2^397139568 is an apocalyptic number.

It is an amenable number.

397139568 is an abundant number, since it is smaller than the sum of its proper divisors (775368720).

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

397139568 is a wasteful number, since it uses less digits than its factorization.

397139568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181981 (or 1181975 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 51.

The square root of 397139568 is about 19928.3608959693. The cubic root of 397139568 is about 735.0457762225.

The spelling of 397139568 in words is "three hundred ninety-seven million, one hundred thirty-nine thousand, five hundred sixty-eight".