397911920 has 40 divisors (see below), whose sum is σ = 1057310304. Its totient is φ = 136426752.

The previous prime is 397911919. The next prime is 397911931. The reversal of 397911920 is 29119793.

It is a tau number, because it is divible by the number of its divisors (40).

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, 354719 + ... + 355838.

Almost surely, 2^397911920 is an apocalyptic number.

It is an amenable number.

397911920 is an abundant number, since it is smaller than the sum of its proper divisors (659398384).

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

397911920 is a wasteful number, since it uses less digits than its factorization.

397911920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710577 (or 710571 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 397911920 is about 19947.7296953814. The cubic root of 397911920 is about 735.5219702279.

The spelling of 397911920 in words is "three hundred ninety-seven million, nine hundred eleven thousand, nine hundred twenty".