397297517 has 4 divisors (see below), whose sum is σ = 398011356. Its totient is φ = 396583680.

The previous prime is 397297507. The next prime is 397297541. The reversal of 397297517 is 715792793.

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

It can be written as a sum of positive squares in 2 ways, for example, as 66275881 + 331021636 = 8141^2 + 18194^2 .

It is a cyclic number.

It is not a de Polignac number, because 397297517 - 2⁴ = 397297501 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 (397297507) 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, 356084 + ... + 357197.

It is an arithmetic number, because the mean of its divisors is an integer number (99502839).

Almost surely, 2^397297517 is an apocalyptic number.

It is an amenable number.

397297517 is a deficient number, since it is larger than the sum of its proper divisors (713839).

397297517 is an equidigital number, since it uses as much as digits as its factorization.

397297517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713838.

The product of its digits is 833490, while the sum is 50.

The square root of 397297517 is about 19932.3234220198. The cubic root of 397297517 is about 735.1432099431.

The spelling of 397297517 in words is "three hundred ninety-seven million, two hundred ninety-seven thousand, five hundred seventeen".