397939713 has 4 divisors (see below), whose sum is σ = 530586288. Its totient is φ = 265293140.

The previous prime is 397939693. The next prime is 397939747. The reversal of 397939713 is 317939793.

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: 317939793 = 3 ⋅105979931.

It is a cyclic number.

It is not a de Polignac number, because 397939713 - 2¹⁰ = 397938689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397939753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66323283 + ... + 66323288.

It is an arithmetic number, because the mean of its divisors is an integer number (132646572).

Almost surely, 2^397939713 is an apocalyptic number.

It is an amenable number.

397939713 is a deficient number, since it is larger than the sum of its proper divisors (132646575).

397939713 is a wasteful number, since it uses less digits than its factorization.

397939713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132646574.

The product of its digits is 964467, while the sum is 51.

The square root of 397939713 is about 19948.4263289113. The cubic root of 397939713 is about 735.5390945253.

The spelling of 397939713 in words is "three hundred ninety-seven million, nine hundred thirty-nine thousand, seven hundred thirteen".