399096320 has 80 divisors (see below), whose sum is σ = 1093644288. Its totient is φ = 136826880.

The previous prime is 399096293. The next prime is 399096323. The reversal of 399096320 is 23690993.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (399096323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6785 + ... + 29055.

Almost surely, 2^399096320 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 399096320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (546822144).

399096320 is an abundant number, since it is smaller than the sum of its proper divisors (694547968).

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

399096320 is an equidigital number, since it uses as much as digits as its factorization.

399096320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22301 (or 22285 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 41.

The square root of 399096320 is about 19977.3952256044. The cubic root of 399096320 is about 736.2510170889.

The spelling of 399096320 in words is "three hundred ninety-nine million, ninety-six thousand, three hundred twenty".