2209805 has 8 divisors (see below), whose sum is σ = 2855832. Its totient is φ = 1631808.

The previous prime is 2209793. The next prime is 2209811. The reversal of 2209805 is 5089022.

It can be written as a sum of positive squares in 4 ways, for example, as 72361 + 2137444 = 269^2 + 1462^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2209805 - 2⁴ = 2209789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16934 + ... + 17063.

It is an arithmetic number, because the mean of its divisors is an integer number (356979).

2^2209805 is an apocalyptic number.

It is an amenable number.

2209805 is a deficient number, since it is larger than the sum of its proper divisors (646027).

2209805 is a wasteful number, since it uses less digits than its factorization.

2209805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34015.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 2209805 is about 1486.5412876876. The cubic root of 2209805 is about 130.2520750035.

The spelling of 2209805 in words is "two million, two hundred nine thousand, eight hundred five".