999222 has 32 divisors (see below), whose sum is σ = 2349312. Its totient is φ = 277344.

The previous prime is 999221. The next prime is 999233. The reversal of 999222 is 222999.

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 (999221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1233 + ... + 1875.

It is an arithmetic number, because the mean of its divisors is an integer number (73416).

2⁹⁹⁹²²² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1174656).

999222 is an abundant number, since it is smaller than the sum of its proper divisors (1350090).

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

999222 is a wasteful number, since it uses less digits than its factorization.

999222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692.

The product of its digits is 5832, while the sum is 33.

The square root of 999222 is about 999.6109243101. The cubic root of 999222 is about 99.9740599384.

Adding to 999222 its reverse (222999), we get a palindrome (1222221).

It can be divided in two parts, 999 and 222, that added together give a palindrome (1221).

The spelling of 999222 in words is "nine hundred ninety-nine thousand, two hundred twenty-two".