397937520 has 180 divisors, whose sum is σ = 1411367256. Its totient is φ = 100465920.

The previous prime is 397937509. The next prime is 397937531. The reversal of 397937520 is 25739793.

397937520 is a `hidden beast` number, since 3 + 97 + 9 + 37 + 520 = 666.

It is an interprime number because it is at equal distance from previous prime (397937509) and next prime (397937531).

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 259155 + ... + 260685.

Almost surely, 2^397937520 is an apocalyptic number.

397937520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397937520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (705683628).

397937520 is an abundant number, since it is smaller than the sum of its proper divisors (1013429736).

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

397937520 is a wasteful number, since it uses less digits than its factorization.

397937520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588 (or 1560 counting only the distinct ones).

The product of its (nonzero) digits is 357210, while the sum is 45.

The square root of 397937520 is about 19948.3713620937. The cubic root of 397937520 is about 735.5377433657.

The spelling of 397937520 in words is "three hundred ninety-seven million, nine hundred thirty-seven thousand, five hundred twenty".