2165841 has 12 divisors (see below), whose sum is σ = 3264768. Its totient is φ = 1380984.

The previous prime is 2165819. The next prime is 2165843. The reversal of 2165841 is 1485612.

2165841 is a `hidden beast` number, since 2 + 1 + 658 + 4 + 1 = 666.

It is not a de Polignac number, because 2165841 - 2⁵ = 2165809 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2165843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5025 + ... + 5438.

It is an arithmetic number, because the mean of its divisors is an integer number (272064).

2^2165841 is an apocalyptic number.

It is an amenable number.

2165841 is a deficient number, since it is larger than the sum of its proper divisors (1098927).

2165841 is a wasteful number, since it uses less digits than its factorization.

2165841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10492 (or 10489 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 2165841 is about 1471.6796526418. The cubic root of 2165841 is about 129.3824955400.

The spelling of 2165841 in words is "two million, one hundred sixty-five thousand, eight hundred forty-one".