2161804 has 12 divisors (see below), whose sum is σ = 3821328. Its totient is φ = 1070000.

The previous prime is 2161787. The next prime is 2161813. The reversal of 2161804 is 4081612.

2161804 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2272 + ... + 3079.

It is an arithmetic number, because the mean of its divisors is an integer number (318444).

2^2161804 is an apocalyptic number.

It is an amenable number.

2161804 is a deficient number, since it is larger than the sum of its proper divisors (1659524).

2161804 is a wasteful number, since it uses less digits than its factorization.

2161804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5456 (or 5454 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 2161804 is about 1470.3074508415. The cubic root of 2161804 is about 129.3020584267.

The spelling of 2161804 in words is "two million, one hundred sixty-one thousand, eight hundred four".