2212644 has 72 divisors (see below), whose sum is σ = 6205248. Its totient is φ = 611520.

The previous prime is 2212633. The next prime is 2212657. The reversal of 2212644 is 4462122.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 2212644.

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, 31129 + ... + 31199.

It is an arithmetic number, because the mean of its divisors is an integer number (86184).

2^2212644 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 2212644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3102624).

2212644 is an abundant number, since it is smaller than the sum of its proper divisors (3992604).

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

2212644 is a wasteful number, since it uses less digits than its factorization.

2212644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 136 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 2212644 is about 1487.4958823472. The cubic root of 2212644 is about 130.3078306616.

Adding to 2212644 its reverse (4462122), we get a palindrome (6674766).

The spelling of 2212644 in words is "two million, two hundred twelve thousand, six hundred forty-four".