397197856 has 96 divisors (see below), whose sum is σ = 904006656. Its totient is φ = 170016000.

The previous prime is 397197841. The next prime is 397197881. The reversal of 397197856 is 658791793.

It is a super-2 number, since 2×397197856² = 315532273621993472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 397197797 and 397197806.

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, 574471 + ... + 575161.

It is an arithmetic number, because the mean of its divisors is an integer number (9416736).

Almost surely, 2^397197856 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 397197856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (452003328).

397197856 is an abundant number, since it is smaller than the sum of its proper divisors (506808800).

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

397197856 is a wasteful number, since it uses less digits than its factorization.

397197856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806 (or 798 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 55.

The square root of 397197856 is about 19929.8232807017. The cubic root of 397197856 is about 735.0817352453.

The spelling of 397197856 in words is "three hundred ninety-seven million, one hundred ninety-seven thousand, eight hundred fifty-six".