999912179 has 6 divisors (see below), whose sum is σ = 1163163204. Its totient is φ = 857067540.

The previous prime is 999912167. The next prime is 999912197. The reversal of 999912179 is 971219999.

It is a de Polignac number, because none of the positive numbers 2^k-999912179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999912379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10203137 + ... + 10203234.

It is an arithmetic number, because the mean of its divisors is an integer number (193860534).

Almost surely, 2^999912179 is an apocalyptic number.

999912179 is a deficient number, since it is larger than the sum of its proper divisors (163251025).

999912179 is a wasteful number, since it uses less digits than its factorization.

999912179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20406385 (or 20406378 counting only the distinct ones).

The product of its digits is 826686, while the sum is 56.

The square root of 999912179 is about 31621.3879992640. The cubic root of 999912179 is about 999.9707254763.

The spelling of 999912179 in words is "nine hundred ninety-nine million, nine hundred twelve thousand, one hundred seventy-nine".