399790292 has 36 divisors (see below), whose sum is σ = 814271220. Its totient is φ = 171029760.

The previous prime is 399790247. The next prime is 399790331. The reversal of 399790292 is 292097993.

It can be written as a sum of positive squares in 2 ways, for example, as 289204036 + 110586256 = 17006^2 + 10516^2 .

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 399790292.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16067 + ... + 32522.

It is an arithmetic number, because the mean of its divisors is an integer number (22618645).

Almost surely, 2^399790292 is an apocalyptic number.

It is an amenable number.

399790292 is an abundant number, since it is smaller than the sum of its proper divisors (414480928).

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

399790292 is a wasteful number, since it uses less digits than its factorization.

399790292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48632 (or 48619 counting only the distinct ones).

The product of its (nonzero) digits is 551124, while the sum is 50.

The square root of 399790292 is about 19994.7566126722. The cubic root of 399790292 is about 736.6775154066.

The spelling of 399790292 in words is "three hundred ninety-nine million, seven hundred ninety thousand, two hundred ninety-two".