222222 is nontrivially palindromic in base 10.
It is a nude number because it is divisible by every one of its digits.
222222 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 congruent number.
It is an unprimeable number.
222222 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2222222 is an apocalyptic number.
222222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.
It is a practical number, because each smaller number is the sum of distinct divisors of 222222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306432).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
222222 is a wasteful number, since it uses less digits than its factorization.
222222 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 73.
The square root of 222222 is about 471.4042850887. The cubic root of 222222 is about 60.5706662375.
The spelling of 222222 in words is "two hundred twenty-two thousand, two hundred twenty-two", and thus it is an iban number.