399243232 has 48 divisors (see below), whose sum is σ = 860978160. Its totient is φ = 181393408.

The previous prime is 399243227. The next prime is 399243233. The reversal of 399243232 is 232342993.

It is a junction number, because it is equal to n+sod(n) for n = 399243191 and 399243200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399243233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3123 + ... + 28429.

It is an arithmetic number, because the mean of its divisors is an integer number (17937045).

Almost surely, 2^399243232 is an apocalyptic number.

399243232 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 399243232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (430489080).

399243232 is an abundant number, since it is smaller than the sum of its proper divisors (461734928).

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

399243232 is a wasteful number, since it uses less digits than its factorization.

399243232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25363 (or 25355 counting only the distinct ones).

The product of its digits is 69984, while the sum is 37.

The square root of 399243232 is about 19981.0718431219. The cubic root of 399243232 is about 736.3413468619.

The spelling of 399243232 in words is "three hundred ninety-nine million, two hundred forty-three thousand, two hundred thirty-two".