999999168 has 112 divisors (see below), whose sum is σ = 3046439424. Its totient is φ = 283576320.

The previous prime is 999999163. The next prime is 999999181. The reversal of 999999168 is 861999999.

999999168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (999999163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181413 + ... + 186843.

It is an arithmetic number, because the mean of its divisors is an integer number (27200352).

Almost surely, 2^999999168 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 999999168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1523219712).

999999168 is an abundant number, since it is smaller than the sum of its proper divisors (2046440256).

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

999999168 is a wasteful number, since it uses less digits than its factorization.

999999168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5590 (or 5580 counting only the distinct ones).

The product of its digits is 25509168, while the sum is 69.

The square root of 999999168 is about 31622.7634466060. The cubic root of 999999168 is about 999.9997226666. Note that the first 3 decimals are identical.

The spelling of 999999168 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, one hundred sixty-eight".