2165889 has 8 divisors (see below), whose sum is σ = 3150432. Its totient is φ = 1312640.

The previous prime is 2165873. The next prime is 2165893. The reversal of 2165889 is 9885612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2165889 - 2⁴ = 2165873 is a prime.

It is a Curzon number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32784 + ... + 32849.

It is an arithmetic number, because the mean of its divisors is an integer number (393804).

2^2165889 is an apocalyptic number.

It is an amenable number.

2165889 is a deficient number, since it is larger than the sum of its proper divisors (984543).

2165889 is a wasteful number, since it uses less digits than its factorization.

2165889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65647.

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

The square root of 2165889 is about 1471.6959604484. The cubic root of 2165889 is about 129.3834513371.

It can be divided in two parts, 216 and 5889, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 2165889 in words is "two million, one hundred sixty-five thousand, eight hundred eighty-nine".