999998222 has 16 divisors (see below), whose sum is σ = 1522621152. Its totient is φ = 492471840.

The previous prime is 999998203. The next prime is 999998243. The reversal of 999998222 is 222899999.

It is a super-2 number, since 2×999998222² = 1999992888006322568, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172808 + ... + 178500.

It is an arithmetic number, because the mean of its divisors is an integer number (95163822).

Almost surely, 2^999998222 is an apocalyptic number.

999998222 is a deficient number, since it is larger than the sum of its proper divisors (522622930).

999998222 is a wasteful number, since it uses less digits than its factorization.

999998222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7003.

The product of its digits is 3779136, while the sum is 59.

The square root of 999998222 is about 31622.7484890229. The cubic root of 999998222 is about 999.9994073330. Note that the first 3 decimals are identical.

The spelling of 999998222 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, two hundred twenty-two".