399360256 has 27 divisors (see below), whose sum is σ = 797799261. Its totient is φ = 199520256.

The previous prime is 399360239. The next prime is 399360257. The reversal of 399360256 is 652063993.

The square root of 399360256 is 19984.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 163430656 + 235929600 = 12784^2 + 15360^2 .

It is a super-2 number, since 2×399360256² = 318977228144771072, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399360257) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 319120 + ... + 320368.

Almost surely, 2^399360256 is an apocalyptic number.

399360256 is the 19984-th square number.

It is an amenable number.

399360256 is a deficient number, since it is larger than the sum of its proper divisors (398439005).

399360256 is an frugal number, since it uses more digits than its factorization.

399360256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2514 (or 1251 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 43.

The cubic root of 399360256 is about 736.4132839545.

The spelling of 399360256 in words is "three hundred ninety-nine million, three hundred sixty thousand, two hundred fifty-six".