399983688 has 48 divisors (see below), whose sum is σ = 1166621820. Its totient is φ = 123071616.

The previous prime is 399983663. The next prime is 399983699. The reversal of 399983688 is 886389993.

It can be written as a sum of positive squares in 2 ways, for example, as 395134884 + 4848804 = 19878^2 + 2202^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 212731 + ... + 214602.

Almost surely, 2^399983688 is an apocalyptic number.

It is an amenable number.

399983688 is an abundant number, since it is smaller than the sum of its proper divisors (766638132).

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

399983688 is a wasteful number, since it uses less digits than its factorization.

399983688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427358 (or 427351 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 63.

The square root of 399983688 is about 19999.5921958424. The cubic root of 399983688 is about 736.7962839383.

The spelling of 399983688 in words is "three hundred ninety-nine million, nine hundred eighty-three thousand, six hundred eighty-eight".