399416832 has 100 divisors (see below), whose sum is σ = 1192277856. Its totient is φ = 133125120.

The previous prime is 399416821. The next prime is 399416867. The reversal of 399416832 is 238614993.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 36657 + ... + 46287.

Almost surely, 2^399416832 is an apocalyptic number.

399416832 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 399416832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (596138928).

399416832 is an abundant number, since it is smaller than the sum of its proper divisors (792861024).

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

399416832 is an frugal number, since it uses more digits than its factorization.

399416832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9661 (or 9636 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 399416832 is about 19985.4154822961. The cubic root of 399416832 is about 736.4480573619.

The spelling of 399416832 in words is "three hundred ninety-nine million, four hundred sixteen thousand, eight hundred thirty-two".