399680252 has 12 divisors (see below), whose sum is σ = 699588960. Its totient is φ = 199797696.

The previous prime is 399680243. The next prime is 399680263. The reversal of 399680252 is 252086993.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21149 + ... + 35307.

It is an arithmetic number, because the mean of its divisors is an integer number (58299080).

Almost surely, 2^399680252 is an apocalyptic number.

It is an amenable number.

399680252 is a deficient number, since it is larger than the sum of its proper divisors (299908708).

399680252 is a wasteful number, since it uses less digits than its factorization.

399680252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21220 (or 21218 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 399680252 is about 19992.0047018802. The cubic root of 399680252 is about 736.6099204416.

It can be divided in two parts, 3996 and 80252, that added together give a palindrome (84248).

The spelling of 399680252 in words is "three hundred ninety-nine million, six hundred eighty thousand, two hundred fifty-two".