397565 has 16 divisors (see below), whose sum is σ = 561792. Its totient is φ = 264384.

The previous prime is 397549. The next prime is 397567. The reversal of 397565 is 565793.

It is a cyclic number.

It is not a de Polignac number, because 397565 - 2⁴ = 397549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1142 + ... + 1448.

It is an arithmetic number, because the mean of its divisors is an integer number (35112).

2³⁹⁷⁵⁶⁵ is an apocalyptic number.

397565 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

397565 is a deficient number, since it is larger than the sum of its proper divisors (164227).

397565 is a wasteful number, since it uses less digits than its factorization.

397565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356.

The product of its digits is 28350, while the sum is 35.

The square root of 397565 is about 630.5275568918. The cubic root of 397565 is about 73.5308152830.

The spelling of 397565 in words is "three hundred ninety-seven thousand, five hundred sixty-five".