2209806 has 24 divisors (see below), whose sum is σ = 4815720. Its totient is φ = 732336.

The previous prime is 2209793. The next prime is 2209811. The reversal of 2209806 is 6089022.

It is a self number, because there is not a number n which added to its sum of digits gives 2209806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5065 + ... + 5483.

It is an arithmetic number, because the mean of its divisors is an integer number (200655).

2^2209806 is an apocalyptic number.

2209806 is an abundant number, since it is smaller than the sum of its proper divisors (2605914).

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

2209806 is a wasteful number, since it uses less digits than its factorization.

2209806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720 (or 717 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 2209806 is about 1486.5416240388. The cubic root of 2209806 is about 130.2520946511.

The spelling of 2209806 in words is "two million, two hundred nine thousand, eight hundred six".