399613257 has 24 divisors (see below), whose sum is σ = 608433280. Its totient is φ = 262031760.

The previous prime is 399613241. The next prime is 399613261. The reversal of 399613257 is 752316993.

399613257 is a `hidden beast` number, since 3 + 9 + 9 + 613 + 25 + 7 = 666.

It is not a de Polignac number, because 399613257 - 2⁴ = 399613241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399613217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1344 + ... + 28302.

Almost surely, 2^399613257 is an apocalyptic number.

It is an amenable number.

399613257 is a deficient number, since it is larger than the sum of its proper divisors (208820023).

399613257 is an equidigital number, since it uses as much as digits as its factorization.

399613257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27035 (or 27023 counting only the distinct ones).

The product of its digits is 306180, while the sum is 45.

The square root of 399613257 is about 19990.3290868360. The cubic root of 399613257 is about 736.5687609239.

The spelling of 399613257 in words is "three hundred ninety-nine million, six hundred thirteen thousand, two hundred fifty-seven".