399631322896 has 45 divisors (see below), whose sum is σ = 838496670111. Its totient is φ = 184430054016.

The previous prime is 399631322879. The next prime is 399631322903. The reversal of 399631322896 is 698223136993.

The square root of 399631322896 is 632164.

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

It can be written as a sum of positive squares in 4 ways, for example, as 267251777296 + 132379545600 = 516964^2 + 363840^2 .

It is a Duffinian number.

It is an unprimeable number.

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 8 ways as a sum of consecutive naturals, for example, 32866450 + ... + 32878606.

Almost surely, 2^399631322896 is an apocalyptic number.

399631322896 is the 632164-th square number.

It is an amenable number.

399631322896 is an abundant number, since it is smaller than the sum of its proper divisors (438865347215).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399631322896 is an frugal number, since it uses more digits than its factorization.

399631322896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24348 (or 12172 counting only the distinct ones).

The product of its digits is 22674816, while the sum is 61.

The spelling of 399631322896 in words is "three hundred ninety-nine billion, six hundred thirty-one million, three hundred twenty-two thousand, eight hundred ninety-six".