397517 has 2 divisors, whose sum is σ = 397518. Its totient is φ = 397516.

The previous prime is 397493. The next prime is 397519. The reversal of 397517 is 715793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 306916 + 90601 = 554^2 + 301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397517 is a prime.

Together with 397519, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198758 + 198759.

It is an arithmetic number, because the mean of its divisors is an integer number (198759).

2³⁹⁷⁵¹⁷ is an apocalyptic number.

It is an amenable number.

397517 is a deficient number, since it is larger than the sum of its proper divisors (1).

397517 is an equidigital number, since it uses as much as digits as its factorization.

397517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6615, while the sum is 32.

The square root of 397517 is about 630.4894923787. The cubic root of 397517 is about 73.5278559169.

The spelling of 397517 in words is "three hundred ninety-seven thousand, five hundred seventeen".