399118428 has 120 divisors (see below), whose sum is σ = 1092833280. Its totient is φ = 126865440.

The previous prime is 399118417. The next prime is 399118441. The reversal of 399118428 is 824811993.

It is a super-3 number, since 3×399118428³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 793225 + ... + 793727.

It is an arithmetic number, because the mean of its divisors is an integer number (9106944).

Almost surely, 2^399118428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399118428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (546416640).

399118428 is an abundant number, since it is smaller than the sum of its proper divisors (693714852).

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

399118428 is a wasteful number, since it uses less digits than its factorization.

399118428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629 (or 618 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 399118428 is about 19977.9485433315. The cubic root of 399118428 is about 736.2646117494.

The spelling of 399118428 in words is "three hundred ninety-nine million, one hundred eighteen thousand, four hundred twenty-eight".