397902397392720 has 320 divisors, whose sum is σ = 1495426430868480. Its totient is φ = 96443249932800.

The previous prime is 397902397392701. The next prime is 397902397392733. The reversal of 397902397392720 is 27293793209793.

397902397392720 is a `hidden beast` number, since 3 + 9 + 7 + 90 + 239 + 7 + 39 + 272 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 126440755 + ... + 129549485.

It is an arithmetic number, because the mean of its divisors is an integer number (4673207596464).

Almost surely, 2^{397902397392720} is an apocalyptic number.

397902397392720 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 397902397392720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (747713215434240).

397902397392720 is an abundant number, since it is smaller than the sum of its proper divisors (1097524033475760).

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

397902397392720 is a wasteful number, since it uses less digits than its factorization.

397902397392720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3114151 (or 3114139 counting only the distinct ones).

The product of its (nonzero) digits is 486091368, while the sum is 72.

The spelling of 397902397392720 in words is "three hundred ninety-seven trillion, nine hundred two billion, three hundred ninety-seven million, three hundred ninety-two thousand, seven hundred twenty".