Adding to 1224720 its reverse (274221), we get a palindrome (1498941).
It is a zygodrome in base 9.
It is an unprimeable number.
21224720 is an apocalyptic number.
1224720 is a gapful number since it is divisible by the number (10) 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 1224720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2440320).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1224720 is an frugal number, since it uses more digits than its factorization.
1224720 is an evil number, because the sum of its binary digits is even.
The square root of 1224720 is about 1106.6706827236. The cubic root of 1224720 is about 106.9905951497.
The spelling of 1224720 in words is "one million, two hundred twenty-four thousand, seven hundred twenty".