397717 has 4 divisors (see below), whose sum is σ = 399040. Its totient is φ = 396396.

The previous prime is 397697. The next prime is 397721. The reversal of 397717 is 717793.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 717793 = 199 ⋅3607.

It is a cyclic number.

It is not a de Polignac number, because 397717 - 2⁷ = 397589 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 (397757) 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, 34 + ... + 892.

It is an arithmetic number, because the mean of its divisors is an integer number (99760).

2³⁹⁷⁷¹⁷ is an apocalyptic number.

It is an amenable number.

397717 is a deficient number, since it is larger than the sum of its proper divisors (1323).

397717 is an equidigital number, since it uses as much as digits as its factorization.

397717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322.

The product of its digits is 9261, while the sum is 34.

The square root of 397717 is about 630.6480793596. The cubic root of 397717 is about 73.5401850379.

The spelling of 397717 in words is "three hundred ninety-seven thousand, seven hundred seventeen".