999915168 has 144 divisors (see below), whose sum is σ = 3152265984. Its totient is φ = 276433920.

The previous prime is 999915131. The next prime is 999915173. The reversal of 999915168 is 861519999.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142396 + ... + 149252.

It is an arithmetic number, because the mean of its divisors is an integer number (21890736).

Almost surely, 2^999915168 is an apocalyptic number.

999915168 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999915168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1576132992).

999915168 is an abundant number, since it is smaller than the sum of its proper divisors (2152350816).

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

999915168 is a wasteful number, since it uses less digits than its factorization.

999915168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6915 (or 6900 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 57.

The square root of 999915168 is about 31621.4352615437. The cubic root of 999915168 is about 999.9717218670.

The spelling of 999915168 in words is "nine hundred ninety-nine million, nine hundred fifteen thousand, one hundred sixty-eight".