397316757 has 4 divisors (see below), whose sum is σ = 529755680. Its totient is φ = 264877836.

The previous prime is 397316723. The next prime is 397316761. The reversal of 397316757 is 757613793.

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 an emirpimes, since its reverse is a distinct semiprime: 757613793 = 3 ⋅252537931.

It is not a de Polignac number, because 397316757 - 2¹⁵ = 397283989 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 (397311757) 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, 66219457 + ... + 66219462.

It is an arithmetic number, because the mean of its divisors is an integer number (132438920).

Almost surely, 2^397316757 is an apocalyptic number.

It is an amenable number.

397316757 is a deficient number, since it is larger than the sum of its proper divisors (132438923).

397316757 is a wasteful number, since it uses less digits than its factorization.

397316757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132438922.

The product of its digits is 833490, while the sum is 48.

The square root of 397316757 is about 19932.8060493248. The cubic root of 397316757 is about 735.1550767234.

The spelling of 397316757 in words is "three hundred ninety-seven million, three hundred sixteen thousand, seven hundred fifty-seven".