1244220 has 48 divisors (see below), whose sum is σ = 3538080. Its totient is φ = 326656.

The previous prime is 1244203. The next prime is 1244233. The reversal of 1244220 is 224421.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1244220.

It is a congruent number.

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, 5224 + ... + 5456.

It is an arithmetic number, because the mean of its divisors is an integer number (73710).

2^1244220 is an apocalyptic number.

1244220 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 1244220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1769040).

1244220 is an abundant number, since it is smaller than the sum of its proper divisors (2293860).

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

1244220 is a wasteful number, since it uses less digits than its factorization.

1244220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 332 counting only the distinct ones).

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

The square root of 1244220 is about 1115.4460991012. The cubic root of 1244220 is about 107.5554428266. Note that the first 3 decimals are identical.

Adding to 1244220 its reverse (224421), we get a palindrome (1468641).

The spelling of 1244220 in words is "one million, two hundred forty-four thousand, two hundred twenty".