13445209 has 4 divisors (see below), whose sum is σ = 13484304. Its totient is φ = 13406116.

The previous prime is 13445207. The next prime is 13445219. The reversal of 13445209 is 90254431.

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 13445209 - 2¹ = 13445207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13445203) 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, 19027 + ... + 19720.

It is an arithmetic number, because the mean of its divisors is an integer number (3371076).

Almost surely, 2^13445209 is an apocalyptic number.

It is an amenable number.

13445209 is a deficient number, since it is larger than the sum of its proper divisors (39095).

13445209 is an equidigital number, since it uses as much as digits as its factorization.

13445209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39094.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 13445209 is about 3666.7709227602. The cubic root of 13445209 is about 237.7875903033.

The spelling of 13445209 in words is "thirteen million, four hundred forty-five thousand, two hundred nine".