1220288 has 28 divisors (see below), whose sum is σ = 2529840. Its totient is φ = 582912.

The previous prime is 1220257. The next prime is 1220309. The reversal of 1220288 is 8820221.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1058 + ... + 1886.

2^1220288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1264920).

1220288 is an abundant number, since it is smaller than the sum of its proper divisors (1309552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220288 is an equidigital number, since it uses as much as digits as its factorization.

1220288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864 (or 854 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 1220288 is about 1104.6664654999. Note that the first 3 decimals coincide. The cubic root of 1220288 is about 106.8613804561.

The spelling of 1220288 in words is "one million, two hundred twenty thousand, two hundred eighty-eight".