399183912 has 24 divisors (see below), whose sum is σ = 1081123290. Its totient is φ = 133061280.

The previous prime is 399183907. The next prime is 399183943. The reversal of 399183912 is 219381993.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 337309956 + 61873956 = 18366^2 + 7866^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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 5 ways as a sum of consecutive naturals, for example, 2772039 + ... + 2772182.

Almost surely, 2^399183912 is an apocalyptic number.

It is an amenable number.

399183912 is an abundant number, since it is smaller than the sum of its proper divisors (681939378).

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

399183912 is a wasteful number, since it uses less digits than its factorization.

399183912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5544233 (or 5544226 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 399183912 is about 19979.5873831268. The cubic root of 399183912 is about 736.3048762523.

The spelling of 399183912 in words is "three hundred ninety-nine million, one hundred eighty-three thousand, nine hundred twelve".