399126528 has 156 divisors (see below), whose sum is σ = 1198572648. Its totient is φ = 132710400.

The previous prime is 399126523. The next prime is 399126529. The reversal of 399126528 is 825621993.

399126528 is a `hidden beast` number, since 39 + 91 + 2 + 6 + 528 = 666.

It is not an unprimeable number, because it can be changed into a prime (399126523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 995128 + ... + 995528.

It is an arithmetic number, because the mean of its divisors is an integer number (7683158).

Almost surely, 2^399126528 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 399126528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (599286324).

399126528 is an abundant number, since it is smaller than the sum of its proper divisors (799446120).

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

399126528 is an frugal number, since it uses more digits than its factorization.

399126528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440 (or 406 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 399126528 is about 19978.1512658204. The cubic root of 399126528 is about 736.2695924791.

The spelling of 399126528 in words is "three hundred ninety-nine million, one hundred twenty-six thousand, five hundred twenty-eight".