399372120 has 160 divisors (see below), whose sum is σ = 1534183200. Its totient is φ = 91279872.

The previous prime is 399372073. The next prime is 399372131. The reversal of 399372120 is 21273993.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 13876 + ... + 31484.

It is an arithmetic number, because the mean of its divisors is an integer number (9588645).

Almost surely, 2^399372120 is an apocalyptic number.

399372120 is a gapful number since it is divisible by the number (30) 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 399372120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (767091600).

399372120 is an abundant number, since it is smaller than the sum of its proper divisors (1134811080).

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

399372120 is a wasteful number, since it uses less digits than its factorization.

399372120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17639 (or 17626 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 399372120 is about 19984.2968352654. The cubic root of 399372120 is about 736.4205762180.

The spelling of 399372120 in words is "three hundred ninety-nine million, three hundred seventy-two thousand, one hundred twenty".