399988032 has 112 divisors (see below), whose sum is σ = 1125809280. Its totient is φ = 125052928.

The previous prime is 399988031. The next prime is 399988051. The reversal of 399988032 is 230889993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399988031) 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, 233194 + ... + 234902.

Almost surely, 2^399988032 is an apocalyptic number.

399988032 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399988032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (562904640).

399988032 is an abundant number, since it is smaller than the sum of its proper divisors (725821248).

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

399988032 is a wasteful number, since it uses less digits than its factorization.

399988032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1800 (or 1790 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 51.

The square root of 399988032 is about 19999.7007977620. The cubic root of 399988032 is about 736.7989512400.

The spelling of 399988032 in words is "three hundred ninety-nine million, nine hundred eighty-eight thousand, thirty-two".