397520720 has 40 divisors (see below), whose sum is σ = 925655040. Its totient is φ = 158764160.

The previous prime is 397520699. The next prime is 397520731. The reversal of 397520720 is 27025793.

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, 54065 + ... + 60975.

It is an arithmetic number, because the mean of its divisors is an integer number (23141376).

Almost surely, 2^397520720 is an apocalyptic number.

It is an amenable number.

397520720 is an abundant number, since it is smaller than the sum of its proper divisors (528134320).

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

397520720 is a wasteful number, since it uses less digits than its factorization.

397520720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7643 (or 7637 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 397520720 is about 19937.9216569832. The cubic root of 397520720 is about 735.2808527627.

The spelling of 397520720 in words is "three hundred ninety-seven million, five hundred twenty thousand, seven hundred twenty".