397908560 has 80 divisors (see below), whose sum is σ = 1091453952. Its totient is φ = 132019200.

The previous prime is 397908559. The next prime is 397908601. The reversal of 397908560 is 65809793.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5900 + ... + 28820.

Almost surely, 2^397908560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397908560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (545726976).

397908560 is an abundant number, since it is smaller than the sum of its proper divisors (693545392).

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

397908560 is a wasteful number, since it uses less digits than its factorization.

397908560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22972 (or 22966 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 397908560 is about 19947.6454750930. The cubic root of 397908560 is about 735.5198999533.

The spelling of 397908560 in words is "three hundred ninety-seven million, nine hundred eight thousand, five hundred sixty".