999844992 has 128 divisors (see below), whose sum is σ = 2968200000. Its totient is φ = 331333632.

The previous prime is 999844973. The next prime is 999845017. The reversal of 999844992 is 299448999.

It is a tau number, because it is divible by the number of its divisors (128).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 666259 + ... + 667757.

Almost surely, 2^999844992 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 999844992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1484100000).

999844992 is an abundant number, since it is smaller than the sum of its proper divisors (1968355008).

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

999844992 is a wasteful number, since it uses less digits than its factorization.

999844992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715 (or 1697 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 63.

The square root of 999844992 is about 31620.3256150217. The cubic root of 999844992 is about 999.9483279967.

It can be divided in two parts, 99984 and 4992, that added together give a 4-th power (104976 = 18⁴).

The spelling of 999844992 in words is "nine hundred ninety-nine million, eight hundred forty-four thousand, nine hundred ninety-two".