399630444 has 24 divisors (see below), whose sum is σ = 955215408. Its totient is φ = 129960960.

The previous prime is 399630391. The next prime is 399630479. The reversal of 399630444 is 444036993.

It is a junction number, because it is equal to n+sod(n) for n = 399630396 and 399630405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405637 + ... + 406620.

It is an arithmetic number, because the mean of its divisors is an integer number (39800642).

Almost surely, 2^399630444 is an apocalyptic number.

It is an amenable number.

399630444 is an abundant number, since it is smaller than the sum of its proper divisors (555584964).

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

399630444 is a wasteful number, since it uses less digits than its factorization.

399630444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812305 (or 812303 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 42.

The square root of 399630444 is about 19990.7589650818. The cubic root of 399630444 is about 736.5793204884.

The spelling of 399630444 in words is "three hundred ninety-nine million, six hundred thirty thousand, four hundred forty-four".