2166863 has 4 divisors (see below), whose sum is σ = 2169960. Its totient is φ = 2163768.

The previous prime is 2166833. The next prime is 2166877. The reversal of 2166863 is 3686612.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2166863 - 2⁸ = 2166607 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 (2166833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56 + ... + 2082.

It is an arithmetic number, because the mean of its divisors is an integer number (542490).

2^2166863 is an apocalyptic number.

2166863 is a deficient number, since it is larger than the sum of its proper divisors (3097).

2166863 is a wasteful number, since it uses less digits than its factorization.

2166863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096.

The product of its digits is 10368, while the sum is 32.

The square root of 2166863 is about 1472.0268339945. The cubic root of 2166863 is about 129.4028430043.

The spelling of 2166863 in words is "two million, one hundred sixty-six thousand, eight hundred sixty-three".