2165804 has 12 divisors (see below), whose sum is σ = 3804528. Its totient is φ = 1078800.

The previous prime is 2165773. The next prime is 2165809. The reversal of 2165804 is 4085612.

It is not an unprimeable number, because it can be changed into a prime (2165809) 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 3 ways as a sum of consecutive naturals, for example, 374 + ... + 2114.

It is an arithmetic number, because the mean of its divisors is an integer number (317044).

2^2165804 is an apocalyptic number.

It is an amenable number.

2165804 is a deficient number, since it is larger than the sum of its proper divisors (1638724).

2165804 is a wasteful number, since it uses less digits than its factorization.

2165804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056 (or 2054 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 2165804 is about 1471.6670819176. The cubic root of 2165804 is about 129.3817587700.

The spelling of 2165804 in words is "two million, one hundred sixty-five thousand, eight hundred four".