2189655 has 48 divisors (see below), whose sum is σ = 4324320. Its totient is φ = 1016064.

The previous prime is 2189647. The next prime is 2189699. The reversal of 2189655 is 5569812.

It is a happy number.

2189655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2189655 - 2³ = 2189647 is a prime.

Its product of digits (21600) is a multiple of the sum of its prime factors (240).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11017 + ... + 11213.

It is an arithmetic number, because the mean of its divisors is an integer number (90090).

2^2189655 is an apocalyptic number.

2189655 is a deficient number, since it is larger than the sum of its proper divisors (2134665).

2189655 is a wasteful number, since it uses less digits than its factorization.

2189655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240 (or 237 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 2189655 is about 1479.7482894060. The cubic root of 2189655 is about 129.8549664597.

It can be divided in two parts, 21 and 89655, that added together give a triangular number (89676 = T₄₂₃).

The spelling of 2189655 in words is "two million, one hundred eighty-nine thousand, six hundred fifty-five".