2165843 has 2 divisors, whose sum is σ = 2165844. Its totient is φ = 2165842.

The previous prime is 2165819. The next prime is 2165857. The reversal of 2165843 is 3485612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2165843 - 2²⁰ = 1117267 is a prime.

It is not a weakly prime, because it can be changed into another prime (2165873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082921 + 1082922.

It is an arithmetic number, because the mean of its divisors is an integer number (1082922).

2^2165843 is an apocalyptic number.

2165843 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165843 is an equidigital number, since it uses as much as digits as its factorization.

2165843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 29.

The square root of 2165843 is about 1471.6803321374. The cubic root of 2165843 is about 129.3825353651.

The spelling of 2165843 in words is "two million, one hundred sixty-five thousand, eight hundred forty-three".