397566 has 24 divisors (see below), whose sum is σ = 928200. Its totient is φ = 122256.

The previous prime is 397549. The next prime is 397567. The reversal of 397566 is 665793.

It is a happy number.

397566 is a `hidden beast` number, since 3 + 97 + 566 = 666.

It is a nialpdrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 397566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397567) by changing a digit.

397566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 616 + ... + 1083.

It is an arithmetic number, because the mean of its divisors is an integer number (38675).

2³⁹⁷⁵⁶⁶ is an apocalyptic number.

397566 is an abundant number, since it is smaller than the sum of its proper divisors (530634).

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

397566 is a wasteful number, since it uses less digits than its factorization.

397566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720 (or 1717 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 397566 is about 630.5283498781. The cubic root of 397566 is about 73.5308769339.

The spelling of 397566 in words is "three hundred ninety-seven thousand, five hundred sixty-six".