999618222 has 16 divisors (see below), whose sum is σ = 2013621120. Its totient is φ = 330808632.

The previous prime is 999618209. The next prime is 999618229. The reversal of 999618222 is 222816999.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999618229) 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 7 ways as a sum of consecutive naturals, for example, 598458 + ... + 600125.

It is an arithmetic number, because the mean of its divisors is an integer number (125851320).

Almost surely, 2^999618222 is an apocalyptic number.

999618222 is an abundant number, since it is smaller than the sum of its proper divisors (1014002898).

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

999618222 is a wasteful number, since it uses less digits than its factorization.

999618222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198727.

The product of its digits is 279936, while the sum is 48.

The square root of 999618222 is about 31616.7395852261. The cubic root of 999618222 is about 999.8727244683.

The spelling of 999618222 in words is "nine hundred ninety-nine million, six hundred eighteen thousand, two hundred twenty-two".