2181444 has 12 divisors (see below), whose sum is σ = 5090064. Its totient is φ = 727144.

The previous prime is 2181419. The next prime is 2181449. The reversal of 2181444 is 4441812.

2181444 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (2181449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90882 + ... + 90905.

It is an arithmetic number, because the mean of its divisors is an integer number (424172).

2^2181444 is an apocalyptic number.

It is an amenable number.

2181444 is an abundant number, since it is smaller than the sum of its proper divisors (2908620).

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

2181444 is a wasteful number, since it uses less digits than its factorization.

2181444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181794 (or 181792 counting only the distinct ones).

The product of its digits is 1024, while the sum is 24.

The square root of 2181444 is about 1476.9712251767. The cubic root of 2181444 is about 129.6924485168.

The spelling of 2181444 in words is "two million, one hundred eighty-one thousand, four hundred forty-four".