13209309 has 12 divisors (see below), whose sum is σ = 19219200. Its totient is φ = 8742024.

The previous prime is 13209307. The next prime is 13209311. The reversal of 13209309 is 90390231.

It is an interprime number because it is at equal distance from previous prime (13209307) and next prime (13209311).

It is not a de Polignac number, because 13209309 - 2¹ = 13209307 is a prime.

It is a Curzon number.

It is a congruent number.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4029 + ... + 6530.

It is an arithmetic number, because the mean of its divisors is an integer number (1601600).

Almost surely, 2^13209309 is an apocalyptic number.

It is an amenable number.

13209309 is a deficient number, since it is larger than the sum of its proper divisors (6009891).

13209309 is a wasteful number, since it uses less digits than its factorization.

13209309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10704 (or 10701 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 13209309 is about 3634.4613080895. The cubic root of 13209309 is about 236.3886932330.

The spelling of 13209309 in words is "thirteen million, two hundred nine thousand, three hundred nine".