13209305 has 8 divisors (see below), whose sum is σ = 15940800. Its totient is φ = 10507696.

The previous prime is 13209293. The next prime is 13209307. The reversal of 13209305 is 50390231.

It is a happy number.

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 13209305 - 2⁶ = 13209241 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13209307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6485 + ... + 8274.

It is an arithmetic number, because the mean of its divisors is an integer number (1992600).

Almost surely, 2^13209305 is an apocalyptic number.

It is an amenable number.

13209305 is a deficient number, since it is larger than the sum of its proper divisors (2731495).

13209305 is a wasteful number, since it uses less digits than its factorization.

13209305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14943.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 13209305 is about 3634.4607578016. The cubic root of 13209305 is about 236.3886693722.

Adding to 13209305 its reverse (50390231), we get a palindrome (63599536).

The spelling of 13209305 in words is "thirteen million, two hundred nine thousand, three hundred five".