399128576 has 96 divisors (see below), whose sum is σ = 995379840. Its totient is φ = 155443200.

The previous prime is 399128557. The next prime is 399128593. The reversal of 399128576 is 675821993.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156431 + ... + 158961.

It is an arithmetic number, because the mean of its divisors is an integer number (10368540).

Almost surely, 2^399128576 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 399128576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (497689920).

399128576 is an abundant number, since it is smaller than the sum of its proper divisors (596251264).

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

399128576 is a wasteful number, since it uses less digits than its factorization.

399128576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571 (or 2551 counting only the distinct ones).

The product of its digits is 816480, while the sum is 50.

The square root of 399128576 is about 19978.2025217485. The cubic root of 399128576 is about 736.2708517937.

The spelling of 399128576 in words is "three hundred ninety-nine million, one hundred twenty-eight thousand, five hundred seventy-six".