399243296 has 48 divisors (see below), whose sum is σ = 818012160. Its totient is φ = 191600640.

The previous prime is 399243293. The next prime is 399243301. The reversal of 399243296 is 692342993.

It is a self number, because there is not a number n which added to its sum of digits gives 399243296.

It is not an unprimeable number, because it can be changed into a prime (399243293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124400 + ... + 127568.

It is an arithmetic number, because the mean of its divisors is an integer number (17041920).

Almost surely, 2^399243296 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399243296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (409006080).

399243296 is an abundant number, since it is smaller than the sum of its proper divisors (418768864).

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

399243296 is a wasteful number, since it uses less digits than its factorization.

399243296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3337 (or 3329 counting only the distinct ones).

The product of its digits is 629856, while the sum is 47.

The square root of 399243296 is about 19981.0734446376. The cubic root of 399243296 is about 736.3413862079.

The spelling of 399243296 in words is "three hundred ninety-nine million, two hundred forty-three thousand, two hundred ninety-six".