999817818 has 32 divisors (see below), whose sum is σ = 2034046464. Its totient is φ = 327560112.

The previous prime is 999817817. The next prime is 999817823. The reversal of 999817818 is 818718999.

It is a super-2 number, since 2×999817818² = 1999271338380562248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (999817813) by changing a digit.

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, 193221 + ... + 198327.

It is an arithmetic number, because the mean of its divisors is an integer number (63563952).

Almost surely, 2^999817818 is an apocalyptic number.

999817818 is an abundant number, since it is smaller than the sum of its proper divisors (1034228646).

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

999817818 is a wasteful number, since it uses less digits than its factorization.

999817818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5666.

The product of its digits is 2612736, while the sum is 60.

The square root of 999817818 is about 31619.8959201323. The cubic root of 999817818 is about 999.9392689785.

The spelling of 999817818 in words is "nine hundred ninety-nine million, eight hundred seventeen thousand, eight hundred eighteen".