2189856 has 24 divisors (see below), whose sum is σ = 5748624. Its totient is φ = 729920.

The previous prime is 2189843. The next prime is 2189867. The reversal of 2189856 is 6589812.

It is a tau number, because it is divible by the number of its divisors (24).

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

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, 11310 + ... + 11501.

It is an arithmetic number, because the mean of its divisors is an integer number (239526).

2^2189856 is an apocalyptic number.

It is an amenable number.

2189856 is an abundant number, since it is smaller than the sum of its proper divisors (3558768).

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

2189856 is a wasteful number, since it uses less digits than its factorization.

2189856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22824 (or 22816 counting only the distinct ones).

The product of its digits is 34560, while the sum is 39.

The square root of 2189856 is about 1479.8162048038. The cubic root of 2189856 is about 129.8589396959.

The spelling of 2189856 in words is "two million, one hundred eighty-nine thousand, eight hundred fifty-six".