397918560 has 192 divisors, whose sum is σ = 1382185728. Its totient is φ = 95606784.

The previous prime is 397918553. The next prime is 397918589. The reversal of 397918560 is 65819793.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 267579 + ... + 269061.

It is an arithmetic number, because the mean of its divisors is an integer number (7198884).

Almost surely, 2^397918560 is an apocalyptic number.

397918560 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 397918560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (691092864).

397918560 is an abundant number, since it is smaller than the sum of its proper divisors (984267168).

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

397918560 is a wasteful number, since it uses less digits than its factorization.

397918560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557 (or 1549 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 397918560 is about 19947.8961296674. The cubic root of 397918560 is about 735.5260614505.

The spelling of 397918560 in words is "three hundred ninety-seven million, nine hundred eighteen thousand, five hundred sixty".