1227520 has 72 divisors (see below), whose sum is σ = 3384864. Its totient is φ = 417792.

The previous prime is 1227497. The next prime is 1227539. The reversal of 1227520 is 257221.

1227520 = 18² + 19² + ... + 154².

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8892 + ... + 9028.

It is an arithmetic number, because the mean of its divisors is an integer number (47012).

2^1227520 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).

1227520 is an abundant number, since it is smaller than the sum of its proper divisors (2157344).

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 sum of its prime factors is 165 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 1227520 is about 1107.9350161449. The cubic root of 1227520 is about 107.0720683728.

Subtracting from 1227520 its reverse (257221), we obtain a cube (970299 = 99³).

The spelling of 1227520 in words is "one million, two hundred twenty-seven thousand, five hundred twenty".