399338720404 has 12 divisors (see below), whose sum is σ = 752599896244. Its totient is φ = 184310178624.

The previous prime is 399338720399. The next prime is 399338720477. The reversal of 399338720404 is 404027833993.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 202689044100 + 196649676304 = 450210^2 + 443452^2 .

It is a super-2 number, since 2×399338720404² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52), and also a Moran number because the ratio is a prime number: 7679590777 = 399338720404 / (3 + 9 + 9 + 3 + 3 + 8 + 7 + 2 + 0 + 4 + 0 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3839795337 + ... + 3839795440.

Almost surely, 2^399338720404 is an apocalyptic number.

It is an amenable number.

399338720404 is a deficient number, since it is larger than the sum of its proper divisors (353261175840).

399338720404 is a wasteful number, since it uses less digits than its factorization.

399338720404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7679590794 (or 7679590792 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 52.

The spelling of 399338720404 in words is "three hundred ninety-nine billion, three hundred thirty-eight million, seven hundred twenty thousand, four hundred four".