It is a happy number.
2222222 is nontrivially palindromic in base 10.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a nude number because it is divisible by every one of its digits.
It is an Ulam number.
2222222 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.
22222222 is an apocalyptic number.
2222222 is a wasteful number, since it uses less digits than its factorization.
2222222 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4890.
The square root of 2222222 is about 1490.7119104643. The cubic root of 2222222 is about 130.4955836891.
The spelling of 2222222 in words is "two million, two hundred twenty-two thousand, two hundred twenty-two".