399459520 has 56 divisors (see below), whose sum is σ = 959717664. Its totient is φ = 158355456.

The previous prime is 399459517. The next prime is 399459527. The reversal of 399459520 is 25954993.

It is not an unprimeable number, because it can be changed into a prime (399459527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30637 + ... + 41683.

Almost surely, 2^399459520 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 399459520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (479858832).

399459520 is an abundant number, since it is smaller than the sum of its proper divisors (560258144).

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

399459520 is a wasteful number, since it uses less digits than its factorization.

399459520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11177 (or 11167 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 46.

The square root of 399459520 is about 19986.4834325601. The cubic root of 399459520 is about 736.4742925897.

The spelling of 399459520 in words is "three hundred ninety-nine million, four hundred fifty-nine thousand, five hundred twenty".