399440008 has 16 divisors (see below), whose sum is σ = 817036560. Its totient is φ = 181563600.

The previous prime is 399439993. The next prime is 399440033. The reversal of 399440008 is 800044993.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2269458 + ... + 2269633.

It is an arithmetic number, because the mean of its divisors is an integer number (51064785).

Almost surely, 2^399440008 is an apocalyptic number.

It is an amenable number.

399440008 is an abundant number, since it is smaller than the sum of its proper divisors (417596552).

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

399440008 is a wasteful number, since it uses less digits than its factorization.

399440008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4539108 (or 4539104 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 399440008 is about 19985.9952967071. The cubic root of 399440008 is about 736.4623011199.

The spelling of 399440008 in words is "three hundred ninety-nine million, four hundred forty thousand, eight".