397578816 has 84 divisors (see below), whose sum is σ = 1159002000. Its totient is φ = 130268928.

The previous prime is 397578809. The next prime is 397578821. The reversal of 397578816 is 618875793.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28135 + ... + 39833.

Almost surely, 2^397578816 is an apocalyptic number.

397578816 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 397578816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (579501000).

397578816 is an abundant number, since it is smaller than the sum of its proper divisors (761423184).

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

397578816 is a wasteful number, since it uses less digits than its factorization.

397578816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11776 (or 11763 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The square root of 397578816 is about 19939.3785259220. The cubic root of 397578816 is about 735.3166704308.

The spelling of 397578816 in words is "three hundred ninety-seven million, five hundred seventy-eight thousand, eight hundred sixteen".