3999631812 has 24 divisors (see below), whose sum is σ = 10180881312. Its totient is φ = 1212009600.

The previous prime is 3999631793. The next prime is 3999631843. The reversal of 3999631812 is 2181369993.

It is a happy number.

3999631812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15149989 + ... + 15150252.

It is an arithmetic number, because the mean of its divisors is an integer number (424203388).

Almost surely, 2^3999631812 is an apocalyptic number.

It is an amenable number.

3999631812 is an abundant number, since it is smaller than the sum of its proper divisors (6181249500).

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

3999631812 is a wasteful number, since it uses less digits than its factorization.

3999631812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30300259 (or 30300257 counting only the distinct ones).

The product of its digits is 629856, while the sum is 51.

The square root of 3999631812 is about 63242.6423546645. The cubic root of 3999631812 is about 1587.3523453055.

The spelling of 3999631812 in words is "three billion, nine hundred ninety-nine million, six hundred thirty-one thousand, eight hundred twelve".