999999812 has 12 divisors (see below), whose sum is σ = 1999999680. Its totient is φ = 428571336.

The previous prime is 999999797. The next prime is 999999883. The reversal of 999999812 is 218999999.

999999812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

999999812 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17857112 + ... + 17857167.

It is an arithmetic number, because the mean of its divisors is an integer number (166666640).

Almost surely, 2^999999812 is an apocalyptic number.

It is an amenable number.

999999812 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

999999812 is a wasteful number, since it uses less digits than its factorization.

999999812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35714290 (or 35714288 counting only the distinct ones).

The product of its digits is 8503056, while the sum is 65.

The square root of 999999812 is about 31622.7736291427. The cubic root of 999999812 is about 999.9999373333. Note that the first 4 decimals are identical.

The spelling of 999999812 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred twelve".