13209209 has 12 divisors (see below), whose sum is σ = 14616576. Its totient is φ = 11926512.

The previous prime is 13209191. The next prime is 13209211. The reversal of 13209209 is 90290231.

It is not a de Polignac number, because 13209209 - 2¹⁶ = 13143673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13209269) 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 11 ways as a sum of consecutive naturals, for example, 7112 + ... + 8774.

It is an arithmetic number, because the mean of its divisors is an integer number (1218048).

Almost surely, 2^13209209 is an apocalyptic number.

It is an amenable number.

13209209 is a deficient number, since it is larger than the sum of its proper divisors (1407367).

13209209 is a wasteful number, since it uses less digits than its factorization.

13209209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736 (or 1723 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 13209209 is about 3634.4475508666. The cubic root of 13209209 is about 236.3880967110.

The spelling of 13209209 in words is "thirteen million, two hundred nine thousand, two hundred nine".