399079000321 has 4 divisors (see below), whose sum is σ = 422554235652. Its totient is φ = 375603764992.

The previous prime is 399079000319. The next prime is 399079000381. The reversal of 399079000321 is 123000970993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 320230360321 + 78848640000 = 565889^2 + 280800^2 .

It is a cyclic number.

It is not a de Polignac number, because 399079000321 - 2¹ = 399079000319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399079000301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11737617640 + ... + 11737617673.

It is an arithmetic number, because the mean of its divisors is an integer number (105638558913).

Almost surely, 2^399079000321 is an apocalyptic number.

It is an amenable number.

399079000321 is a deficient number, since it is larger than the sum of its proper divisors (23475235331).

399079000321 is a wasteful number, since it uses less digits than its factorization.

399079000321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23475235330.

The product of its (nonzero) digits is 91854, while the sum is 43.

The spelling of 399079000321 in words is "three hundred ninety-nine billion, seventy-nine million, three hundred twenty-one", and thus it is an aban number.