2185805 has 16 divisors (see below), whose sum is σ = 2782080. Its totient is φ = 1645248.

The previous prime is 2185801. The next prime is 2185853. The reversal of 2185805 is 5085812.

It is a cyclic number.

It is not a de Polignac number, because 2185805 - 2² = 2185801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9431 + ... + 9659.

It is an arithmetic number, because the mean of its divisors is an integer number (173880).

2^2185805 is an apocalyptic number.

It is an amenable number.

2185805 is a deficient number, since it is larger than the sum of its proper divisors (596275).

2185805 is a wasteful number, since it uses less digits than its factorization.

2185805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 2185805 is about 1478.4468201461. The cubic root of 2185805 is about 129.7788152064.

The spelling of 2185805 in words is "two million, one hundred eighty-five thousand, eight hundred five".