It is a happy number.
2222640 is a `hidden beast` number, since 2 + 2 + 22 + 640 = 666.
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is an unprimeable number.
22222640 is an apocalyptic number.
2222640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 2222640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4501200).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2222640 is an equidigital number, since it uses as much as digits as its factorization.
2222640 is an odious number, because the sum of its binary digits is odd.
The square root of 2222640 is about 1490.8521053411. The cubic root of 2222640 is about 130.5037652501.
Adding to 2222640 its reverse (462222), we get a palindrome (2684862).
The spelling of 2222640 in words is "two million, two hundred twenty-two thousand, six hundred forty".