397391156 has 24 divisors (see below), whose sum is σ = 733104960. Its totient is φ = 187963200.

The previous prime is 397391143. The next prime is 397391161. The reversal of 397391156 is 651193793.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54401 + ... + 61271.

It is an arithmetic number, because the mean of its divisors is an integer number (30546040).

Almost surely, 2^397391156 is an apocalyptic number.

It is an amenable number.

397391156 is a deficient number, since it is larger than the sum of its proper divisors (335713804).

397391156 is a wasteful number, since it uses less digits than its factorization.

397391156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7655 (or 7653 counting only the distinct ones).

The product of its digits is 153090, while the sum is 44.

The square root of 397391156 is about 19934.6722069865. The cubic root of 397391156 is about 735.2009606754.

The spelling of 397391156 in words is "three hundred ninety-seven million, three hundred ninety-one thousand, one hundred fifty-six".