999109992 has 96 divisors (see below), whose sum is σ = 2667952800. Its totient is φ = 311725056.

The previous prime is 999109987. The next prime is 999110027. The reversal of 999109992 is 299901999.

It is a super-2 number, since 2×999109992² = 1996441552228480128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1962634 + ... + 1963142.

It is an arithmetic number, because the mean of its divisors is an integer number (27791175).

Almost surely, 2^999109992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999109992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1333976400).

999109992 is an abundant number, since it is smaller than the sum of its proper divisors (1668842808).

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

999109992 is a wasteful number, since it uses less digits than its factorization.

999109992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 1062882, while the sum is 57.

The square root of 999109992 is about 31608.7012071044. The cubic root of 999109992 is about 999.7032426104.

The spelling of 999109992 in words is "nine hundred ninety-nine million, one hundred nine thousand, nine hundred ninety-two".