397993536 has 84 divisors (see below), whose sum is σ = 1162389852. Its totient is φ = 130151424.

The previous prime is 397993523. The next prime is 397993559. The reversal of 397993536 is 635399793.

397993536 is a `hidden beast` number, since 39 + 79 + 9 + 3 + 536 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 278222400 + 119771136 = 16680^2 + 10944^2 .

It is a congruent number.

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, 24010 + ... + 37046.

Almost surely, 2^397993536 is an apocalyptic number.

397993536 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 397993536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (581194926).

397993536 is an abundant number, since it is smaller than the sum of its proper divisors (764396316).

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

397993536 is a wasteful number, since it uses less digits than its factorization.

397993536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13108 (or 13095 counting only the distinct ones).

The product of its digits is 4133430, while the sum is 54.

The square root of 397993536 is about 19949.7753370809. The cubic root of 397993536 is about 735.5722546035.

The spelling of 397993536 in words is "three hundred ninety-seven million, nine hundred ninety-three thousand, five hundred thirty-six".