399403776256 has 27 divisors (see below), whose sum is σ = 797267566011. Its totient is φ = 199696832256.

The previous prime is 399403776199. The next prime is 399403776263. The reversal of 399403776256 is 652677304993.

The square root of 399403776256 is 631984.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399403776194 and 399403776203.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 10091995 + ... + 10131493.

Almost surely, 2^399403776256 is an apocalyptic number.

399403776256 is the 631984-th square number.

It is an amenable number.

399403776256 is a deficient number, since it is larger than the sum of its proper divisors (397863789755).

399403776256 is an frugal number, since it uses more digits than its factorization.

399403776256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79014 (or 39501 counting only the distinct ones).

The product of its (nonzero) digits is 51438240, while the sum is 61.

The spelling of 399403776256 in words is "three hundred ninety-nine billion, four hundred three million, seven hundred seventy-six thousand, two hundred fifty-six".