399109128 has 64 divisors (see below), whose sum is σ = 1123614720. Its totient is φ = 117038400.

The previous prime is 399109127. The next prime is 399109189. The reversal of 399109128 is 821901993.

It is a self number, because there is not a number n which added to its sum of digits gives 399109128.

It is not an unprimeable number, because it can be changed into a prime (399109127) 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, 16200 + ... + 32567.

It is an arithmetic number, because the mean of its divisors is an integer number (17556480).

Almost surely, 2^399109128 is an apocalyptic number.

It is an amenable number.

399109128 is an abundant number, since it is smaller than the sum of its proper divisors (724505592).

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

399109128 is a wasteful number, since it uses less digits than its factorization.

399109128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48818 (or 48814 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 399109128 is about 19977.7157853444. The cubic root of 399109128 is about 736.2588930508.

The spelling of 399109128 in words is "three hundred ninety-nine million, one hundred nine thousand, one hundred twenty-eight".