2165887 has 4 divisors (see below), whose sum is σ = 2260080. Its totient is φ = 2071696.

The previous prime is 2165873. The next prime is 2165893. The reversal of 2165887 is 7885612.

2165887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2165887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165857) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 47062 + ... + 47107.

It is an arithmetic number, because the mean of its divisors is an integer number (565020).

2^2165887 is an apocalyptic number.

2165887 is a deficient number, since it is larger than the sum of its proper divisors (94193).

2165887 is an equidigital number, since it uses as much as digits as its factorization.

2165887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94192.

The product of its digits is 26880, while the sum is 37.

The square root of 2165887 is about 1471.6952809600. The cubic root of 2165887 is about 129.3834115125.

The spelling of 2165887 in words is "two million, one hundred sixty-five thousand, eight hundred eighty-seven".