2220444 has 36 divisors (see below), whose sum is σ = 5767944. Its totient is φ = 719712.

The previous prime is 2220431. The next prime is 2220457. The reversal of 2220444 is 4440222.

2220444 is a `hidden beast` number, since 2 + 220 + 444 = 666.

It is an interprime number because it is at equal distance from previous prime (2220431) and next prime (2220457).

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 499 + ... + 2165.

2^2220444 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 2220444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2883972).

2220444 is an abundant number, since it is smaller than the sum of its proper divisors (3547500).

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

2220444 is a wasteful number, since it uses less digits than its factorization.

2220444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714 (or 1709 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 2220444 is about 1490.1154317703. The cubic root of 2220444 is about 130.4607712273.

Adding to 2220444 its reverse (4440222), we get a palindrome (6660666).

The spelling of 2220444 in words is "two million, two hundred twenty thousand, four hundred forty-four".