2165886 has 32 divisors (see below), whose sum is σ = 5068800. Its totient is φ = 683640.

The previous prime is 2165873. The next prime is 2165893. The reversal of 2165886 is 6885612.

It is a happy number.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 6² + 5⁵ + 8⁵ + 8⁵ + 6² .

It is a self number, because there is not a number n which added to its sum of digits gives 2165886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30 + ... + 2081.

It is an arithmetic number, because the mean of its divisors is an integer number (158400).

2^2165886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2165886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2534400).

2165886 is an abundant number, since it is smaller than the sum of its proper divisors (2902914).

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

2165886 is a wasteful number, since it uses less digits than its factorization.

2165886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141 (or 2135 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2165886 is about 1471.6949412157. The cubic root of 2165886 is about 129.3833916002.

The spelling of 2165886 in words is "two million, one hundred sixty-five thousand, eight hundred eighty-six".