397257513 has 8 divisors (see below), whose sum is σ = 560834208. Its totient is φ = 249259584.

The previous prime is 397257503. The next prime is 397257517. The reversal of 397257513 is 315752793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 397257513 - 2⁵ = 397257481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (397257517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3894631 + ... + 3894732.

It is an arithmetic number, because the mean of its divisors is an integer number (70104276).

Almost surely, 2^397257513 is an apocalyptic number.

It is an amenable number.

397257513 is a deficient number, since it is larger than the sum of its proper divisors (163576695).

397257513 is a wasteful number, since it uses less digits than its factorization.

397257513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7789383.

The product of its digits is 198450, while the sum is 42.

The square root of 397257513 is about 19931.3199011004. The cubic root of 397257513 is about 735.1185351886.

The spelling of 397257513 in words is "three hundred ninety-seven million, two hundred fifty-seven thousand, five hundred thirteen".