13208209 has 4 divisors (see below), whose sum is σ = 15095104. Its totient is φ = 11321316.

The previous prime is 13208207. The next prime is 13208213. The reversal of 13208209 is 90280231.

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.

It is a cyclic number.

It is not a de Polignac number, because 13208209 - 2¹ = 13208207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13208203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943437 + ... + 943450.

It is an arithmetic number, because the mean of its divisors is an integer number (3773776).

Almost surely, 2^13208209 is an apocalyptic number.

It is an amenable number.

13208209 is a deficient number, since it is larger than the sum of its proper divisors (1886895).

13208209 is an equidigital number, since it uses as much as digits as its factorization.

13208209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886894.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 13208209 is about 3634.3099757726. The cubic root of 13208209 is about 236.3821313258.

The spelling of 13208209 in words is "thirteen million, two hundred eight thousand, two hundred nine".