397971567 has 24 divisors (see below), whose sum is σ = 659742720. Its totient is φ = 226452240.

The previous prime is 397971559. The next prime is 397971569. The reversal of 397971567 is 765179793.

397971567 is a `hidden beast` number, since 3 + 9 + 7 + 9 + 71 + 567 = 666.

It is not a de Polignac number, because 397971567 - 2³ = 397971559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397971569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1842 + ... + 28272.

It is an arithmetic number, because the mean of its divisors is an integer number (27489280).

Almost surely, 2^397971567 is an apocalyptic number.

397971567 is a deficient number, since it is larger than the sum of its proper divisors (261771153).

397971567 is a wasteful number, since it uses less digits than its factorization.

397971567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26683 (or 26680 counting only the distinct ones).

The product of its digits is 2500470, while the sum is 54.

The square root of 397971567 is about 19949.2247217780. The cubic root of 397971567 is about 735.5587199748.

The spelling of 397971567 in words is "three hundred ninety-seven million, nine hundred seventy-one thousand, five hundred sixty-seven".