21224256 is an apocalyptic number.
1224256 is a gapful number since it is divisible by the number (16) 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 1224256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1389888).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1224256 is a wasteful number, since it uses less digits than its factorization.
1224256 is an evil number, because the sum of its binary digits is even.
The square root of 1224256 is about 1106.4610250705. The cubic root of 1224256 is about 106.9770818823.
Adding to 1224256 its reverse (6524221), we get a palindrome (7748477).
The spelling of 1224256 in words is "one million, two hundred twenty-four thousand, two hundred fifty-six".