1222440 has 64 divisors (see below), whose sum is σ = 3749760. Its totient is φ = 318720.

The previous prime is 1222433. The next prime is 1222471. The reversal of 1222440 is 442221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7237 + ... + 7403.

It is an arithmetic number, because the mean of its divisors is an integer number (58590).

2^1222440 is an apocalyptic number.

1222440 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 1222440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1874880).

1222440 is an abundant number, since it is smaller than the sum of its proper divisors (2527320).

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

1222440 is a wasteful number, since it uses less digits than its factorization.

1222440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 1222440 is about 1105.6400861040. The cubic root of 1222440 is about 106.9241608927.

Adding to 1222440 its reverse (442221), we get a palindrome (1664661).

The spelling of 1222440 in words is "one million, two hundred twenty-two thousand, four hundred forty".