2209309 has 4 divisors (see below), whose sum is σ = 2212416. Its totient is φ = 2206204.

The previous prime is 2209289. The next prime is 2209313. The reversal of 2209309 is 9039022.

2209309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2209309 - 2⁹ = 2208797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2209409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102 + ... + 2104.

It is an arithmetic number, because the mean of its divisors is an integer number (553104).

2^2209309 is an apocalyptic number.

It is an amenable number.

2209309 is a deficient number, since it is larger than the sum of its proper divisors (3107).

2209309 is a wasteful number, since it uses less digits than its factorization.

2209309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 2209309 is about 1486.3744481119. The cubic root of 2209309 is about 130.2423290661.

The spelling of 2209309 in words is "two million, two hundred nine thousand, three hundred nine".