999009792 has 120 divisors (see below), whose sum is σ = 3145479480. Its totient is φ = 302714880.

The previous prime is 999009787. The next prime is 999009833. The reversal of 999009792 is 297900999.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40834 + ... + 60542.

It is an arithmetic number, because the mean of its divisors is an integer number (26212329).

Almost surely, 2^999009792 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 999009792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1572739740).

999009792 is an abundant number, since it is smaller than the sum of its proper divisors (2146469688).

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

999009792 is a wasteful number, since it uses less digits than its factorization.

999009792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19744 (or 19725 counting only the distinct ones).

The product of its (nonzero) digits is 826686, while the sum is 54.

The square root of 999009792 is about 31607.1161607635. The cubic root of 999009792 is about 999.6698216609.

The spelling of 999009792 in words is "nine hundred ninety-nine million, nine thousand, seven hundred ninety-two".