222222222 has 24 divisors (see below), whose sum is σ = 494495976.
Its totient is φ = 72071856.
The previous prime is 222222193. The next prime is 222222227.
It can be divided in two parts, 22222222 and 2, that multiplied together give a palindrome (44444444).
222222222 is a `hidden beast` number, since 222 + 222 + 222 = 666.
222222222 is nontrivially palindromic in base 10.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a nude number because it is divisible by every one of its digits.
222222222 is a modest number, since divided by 22222 gives 2222 as remainder.
222222222 is a nontrivial repdigit in base 10.
It is a plaindrome in base 10.
It is a nialpdrome in base 10.
It is a zygodrome in base 10.
It is a junction number, because it is equal to n+sod(n) for n = 222222195 and 222222204.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (222222227) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166168 + ... + 167499.
It is an arithmetic number, because the mean of its divisors is an integer number (20603999).
Almost surely, 2222222222 is an apocalyptic number.
222222222 is an abundant number, since it is smaller than the sum of its proper divisors (272273754).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
222222222 is a wasteful number, since it uses less digits than its factorization.
222222222 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 333712 (or 333709 counting only the distinct ones).
The product of its digits is 512, while the sum is 18.
The square root of 222222222 is about 14907.1198425450.
The cubic root of 222222222 is about 605.7068640755.
The spelling of 222222222 in words is "two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-two".