2189868 has 12 divisors (see below), whose sum is σ = 5109720. Its totient is φ = 729952.

The previous prime is 2189867. The next prime is 2189879. The reversal of 2189868 is 8689812.

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 (2189867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91233 + ... + 91256.

It is an arithmetic number, because the mean of its divisors is an integer number (425810).

2^2189868 is an apocalyptic number.

It is an amenable number.

2189868 is an abundant number, since it is smaller than the sum of its proper divisors (2919852).

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

2189868 is a wasteful number, since it uses less digits than its factorization.

2189868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182496 (or 182494 counting only the distinct ones).

The product of its digits is 55296, while the sum is 42.

The square root of 2189868 is about 1479.8202593558. The cubic root of 2189868 is about 129.8591768964.

The spelling of 2189868 in words is "two million, one hundred eighty-nine thousand, eight hundred sixty-eight".