399983808 has 56 divisors (see below), whose sum is σ = 1209478912. Its totient is φ = 114280704.

The previous prime is 399983797. The next prime is 399983809. The reversal of 399983808 is 808389993.

It is a tau number, because it is divible by the number of its divisors (56).

It is not an unprimeable number, because it can be changed into a prime (399983809) 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, 147460 + ... + 150147.

Almost surely, 2^399983808 is an apocalyptic number.

It is an amenable number.

399983808 is an abundant number, since it is smaller than the sum of its proper divisors (809495104).

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

399983808 is a wasteful number, since it uses less digits than its factorization.

399983808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297629 (or 297619 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 57.

The square root of 399983808 is about 19999.5951959033. The cubic root of 399983808 is about 736.7963576209.

The spelling of 399983808 in words is "three hundred ninety-nine million, nine hundred eighty-three thousand, eight hundred eight".