399885920 has 96 divisors (see below), whose sum is σ = 1084140288. Its totient is φ = 136539648.

The previous prime is 399885919. The next prime is 399885929. The reversal of 399885920 is 29588993.

It is a happy number.

399885920 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399885929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343259 + ... + 344421.

It is an arithmetic number, because the mean of its divisors is an integer number (11293128).

Almost surely, 2^399885920 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 399885920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (542070144).

399885920 is an abundant number, since it is smaller than the sum of its proper divisors (684254368).

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

399885920 is a wasteful number, since it uses less digits than its factorization.

399885920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492 (or 1484 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 53.

The square root of 399885920 is about 19997.1477966234. The cubic root of 399885920 is about 736.7362473491.

The spelling of 399885920 in words is "three hundred ninety-nine million, eight hundred eighty-five thousand, nine hundred twenty".