Subtracting from 1227520 its reverse (257221), we obtain a cube (970299 = 993).
It is an unprimeable number.
21227520 is an apocalyptic number.
1227520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
1227520 is the 640-th octagonal number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1227520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1692432).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1227520 is an equidigital number, since it uses as much as digits as its factorization.
1227520 is an evil number, because the sum of its binary digits is even.
The square root of 1227520 is about 1107.9350161449. The cubic root of 1227520 is about 107.0720683728.
The spelling of 1227520 in words is "one million, two hundred twenty-seven thousand, five hundred twenty".