397637856 has 384 divisors, whose sum is σ = 1490227200. Its totient is φ = 100154880.

The previous prime is 397637797. The next prime is 397637857. The reversal of 397637856 is 658736793.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397637857) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2860635 + ... + 2860773.

It is an arithmetic number, because the mean of its divisors is an integer number (3880800).

Almost surely, 2^397637856 is an apocalyptic number.

397637856 is a gapful number since it is divisible by the number (36) 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 397637856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (745113600).

397637856 is an abundant number, since it is smaller than the sum of its proper divisors (1092589344).

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

397637856 is a wasteful number, since it uses less digits than its factorization.

397637856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 205 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 54.

The square root of 397637856 is about 19940.8589584301. The cubic root of 397637856 is about 735.3530665245.

The spelling of 397637856 in words is "three hundred ninety-seven million, six hundred thirty-seven thousand, eight hundred fifty-six".