6399187812 has 24 divisors (see below), whose sum is σ = 16590487200. Its totient is φ = 2133062568.

The previous prime is 6399187799. The next prime is 6399187819. The reversal of 6399187812 is 2187819936.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (6399187819) 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, 29625762 + ... + 29625977.

It is an arithmetic number, because the mean of its divisors is an integer number (691270300).

Almost surely, 2^6399187812 is an apocalyptic number.

It is an amenable number.

6399187812 is an abundant number, since it is smaller than the sum of its proper divisors (10191299388).

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

6399187812 is a wasteful number, since it uses less digits than its factorization.

6399187812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59251752 (or 59251744 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 6399187812 is about 79994.9236639426. The cubic root of 6399187812 is about 1856.5569917319.

The spelling of 6399187812 in words is "six billion, three hundred ninety-nine million, one hundred eighty-seven thousand, eight hundred twelve".