399939630 has 32 divisors (see below), whose sum is σ = 960812064. Its totient is φ = 106544256.

The previous prime is 399939577. The next prime is 399939647. The reversal of 399939630 is 36939993.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26692 + ... + 38888.

It is an arithmetic number, because the mean of its divisors is an integer number (30025377).

Almost surely, 2^399939630 is an apocalyptic number.

399939630 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

399939630 is an abundant number, since it is smaller than the sum of its proper divisors (560872434).

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

399939630 is a wasteful number, since it uses less digits than its factorization.

399939630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13300.

The product of its (nonzero) digits is 1062882, while the sum is 51.

The square root of 399939630 is about 19998.4906930498. The cubic root of 399939630 is about 736.7692303662.

The spelling of 399939630 in words is "three hundred ninety-nine million, nine hundred thirty-nine thousand, six hundred thirty".