397580508864 has 560 divisors, whose sum is σ = 1499425804800. Its totient is φ = 103262584320.

The previous prime is 397580508859. The next prime is 397580508877. The reversal of 397580508864 is 468805085793.

It is a super-2 number, since 2×397580508864² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 19549069 + ... + 19569395.

It is an arithmetic number, because the mean of its divisors is an integer number (2677546080).

Almost surely, 2^397580508864 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 397580508864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749712902400).

397580508864 is an abundant number, since it is smaller than the sum of its proper divisors (1101845295936).

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

397580508864 is a wasteful number, since it uses less digits than its factorization.

397580508864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20383 (or 20350 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 63.

The spelling of 397580508864 in words is "three hundred ninety-seven billion, five hundred eighty million, five hundred eight thousand, eight hundred sixty-four".