1222290 has 48 divisors (see below), whose sum is σ = 3302208. Its totient is φ = 325296.

The previous prime is 1222279. The next prime is 1222307. The reversal of 1222290 is 922221.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2179 + ... + 2681.

It is an arithmetic number, because the mean of its divisors is an integer number (68796).

2^1222290 is an apocalyptic number.

1222290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1651104).

1222290 is an abundant number, since it is smaller than the sum of its proper divisors (2079918).

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

1222290 is an equidigital number, since it uses as much as digits as its factorization.

1222290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525 (or 513 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1222290 is about 1105.5722500135. The cubic root of 1222290 is about 106.9197873229.

The spelling of 1222290 in words is "one million, two hundred twenty-two thousand, two hundred ninety".