999999222 has 64 divisors (see below), whose sum is σ = 2190259200. Its totient is φ = 303264000.

The previous prime is 999999197. The next prime is 999999223. The reversal of 999999222 is 222999999.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999223) 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 31 ways as a sum of consecutive naturals, for example, 331722 + ... + 334722.

It is an arithmetic number, because the mean of its divisors is an integer number (34222800).

Almost surely, 2^999999222 is an apocalyptic number.

999999222 is an abundant number, since it is smaller than the sum of its proper divisors (1190259978).

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

999999222 is a wasteful number, since it uses less digits than its factorization.

999999222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3141.

The product of its digits is 4251528, while the sum is 60.

The square root of 999999222 is about 31622.7643004213. The cubic root of 999999222 is about 999.9997406666. Note that the first 3 decimals are identical.

The spelling of 999999222 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, two hundred twenty-two".