2189844 has 36 divisors (see below), whose sum is σ = 5634720. Its totient is φ = 716880.

The previous prime is 2189843. The next prime is 2189867. The reversal of 2189844 is 4489812.

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 (36).

It is a junction number, because it is equal to n+sod(n) for n = 2189799 and 2189808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1609 + ... + 2639.

It is an arithmetic number, because the mean of its divisors is an integer number (156520).

2^2189844 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 2189844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2817360).

2189844 is an abundant number, since it is smaller than the sum of its proper divisors (3444876).

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

2189844 is a wasteful number, since it uses less digits than its factorization.

2189844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100 (or 1095 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 2189844 is about 1479.8121502407. The cubic root of 2189844 is about 129.8587024946.

Subtracting 2189844 from its reverse (4489812), we obtain a cube (2299968 = 132³).

The spelling of 2189844 in words is "two million, one hundred eighty-nine thousand, eight hundred forty-four".