397581 has 4 divisors (see below), whose sum is σ = 530112. Its totient is φ = 265052.

The previous prime is 397567. The next prime is 397589. The reversal of 397581 is 185793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 397581 - 2⁵ = 397549 is a prime.

It is a super-2 number, since 2×397581² = 316141303122, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 397581.

It is not an unprimeable number, because it can be changed into a prime (397589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66261 + ... + 66266.

It is an arithmetic number, because the mean of its divisors is an integer number (132528).

2³⁹⁷⁵⁸¹ is an apocalyptic number.

It is an amenable number.

397581 is a deficient number, since it is larger than the sum of its proper divisors (132531).

397581 is a wasteful number, since it uses less digits than its factorization.

397581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132530.

The product of its digits is 7560, while the sum is 33.

The square root of 397581 is about 630.5402445522. The cubic root of 397581 is about 73.5318016855.

The spelling of 397581 in words is "three hundred ninety-seven thousand, five hundred eighty-one".