399510944 has 24 divisors (see below), whose sum is σ = 898900128. Its totient is φ = 171218880.

The previous prime is 399510913. The next prime is 399510961. The reversal of 399510944 is 449015993.

It is a happy number.

It is a super-2 number, since 2×399510944² = 319217988751542272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 399510895 and 399510904.

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, 891542 + ... + 891989.

It is an arithmetic number, because the mean of its divisors is an integer number (37454172).

Almost surely, 2^399510944 is an apocalyptic number.

It is an amenable number.

399510944 is an abundant number, since it is smaller than the sum of its proper divisors (499389184).

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

399510944 is a wasteful number, since it uses less digits than its factorization.

399510944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783548 (or 1783540 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 399510944 is about 19987.7698605923. The cubic root of 399510944 is about 736.5058943141.

The spelling of 399510944 in words is "three hundred ninety-nine million, five hundred ten thousand, nine hundred forty-four".