397663 has 4 divisors (see below), whose sum is σ = 454480. Its totient is φ = 340848.

The previous prime is 397643. The next prime is 397673. The reversal of 397663 is 366793.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 397663 - 2⁹ = 397151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28398 + ... + 28411.

It is an arithmetic number, because the mean of its divisors is an integer number (113620).

2³⁹⁷⁶⁶³ is an apocalyptic number.

397663 is a deficient number, since it is larger than the sum of its proper divisors (56817).

397663 is an equidigital number, since it uses as much as digits as its factorization.

397663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56816.

The product of its digits is 20412, while the sum is 34.

The square root of 397663 is about 630.6052648052. The cubic root of 397663 is about 73.5368565827.

The spelling of 397663 in words is "three hundred ninety-seven thousand, six hundred sixty-three".