399052404 has 18 divisors (see below), whose sum is σ = 1008715890. Its totient is φ = 133017456.

The previous prime is 399052393. The next prime is 399052417. The reversal of 399052404 is 404250993.

It can be written as a sum of positive squares in only one way, i.e., 273836304 + 125216100 = 16548^2 + 11190^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×399052404² = 318485642276358432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 11084789 = 399052404 / (3 + 9 + 9 + 0 + 5 + 2 + 4 + 0 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5542359 + ... + 5542430.

Almost surely, 2^399052404 is an apocalyptic number.

It is an amenable number.

399052404 is an abundant number, since it is smaller than the sum of its proper divisors (609663486).

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

399052404 is a wasteful number, since it uses less digits than its factorization.

399052404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11084799 (or 11084794 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 399052404 is about 19976.2960530725. The cubic root of 399052404 is about 736.2240107548.

The spelling of 399052404 in words is "three hundred ninety-nine million, fifty-two thousand, four hundred four".