399033646 has 8 divisors (see below), whose sum is σ = 652964184. Its totient is φ = 181378920.

The previous prime is 399033629. The next prime is 399033659. The reversal of 399033646 is 646330993.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 9068925 + ... + 9068968.

It is an arithmetic number, because the mean of its divisors is an integer number (81620523).

Almost surely, 2^399033646 is an apocalyptic number.

399033646 is a deficient number, since it is larger than the sum of its proper divisors (253930538).

399033646 is a wasteful number, since it uses less digits than its factorization.

399033646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18137906.

The product of its (nonzero) digits is 314928, while the sum is 43.

The square root of 399033646 is about 19975.8265410971. The cubic root of 399033646 is about 736.2124748377.

It can be divided in two parts, 3990 and 33646, that added together give a square (37636 = 194²).

The spelling of 399033646 in words is "three hundred ninety-nine million, thirty-three thousand, six hundred forty-six".