2166804 has 24 divisors (see below), whose sum is σ = 5617920. Its totient is φ = 722232.

The previous prime is 2166797. The next prime is 2166821. The reversal of 2166804 is 4086612.

Added to its reverse (4086612) it gives a triangular number (6253416 = T₃₅₃₆).

2166804 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9924 + ... + 10139.

It is an arithmetic number, because the mean of its divisors is an integer number (234080).

2^2166804 is an apocalyptic number.

It is an amenable number.

2166804 is an abundant number, since it is smaller than the sum of its proper divisors (3451116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2166804 is a wasteful number, since it uses less digits than its factorization.

2166804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20076 (or 20068 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 2166804 is about 1472.0067934626. The cubic root of 2166804 is about 129.4016685204.

Adding to 2166804 its reverse (4086612), we get a triangular number (6253416 = T₃₅₃₆).

The spelling of 2166804 in words is "two million, one hundred sixty-six thousand, eight hundred four".