13242209 has 4 divisors (see below), whose sum is σ = 13492116. Its totient is φ = 12992304.

The previous prime is 13242199. The next prime is 13242253. The reversal of 13242209 is 90224231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90224231 = 41 ⋅2200591.

It can be written as a sum of positive squares in 2 ways, for example, as 11560000 + 1682209 = 3400^2 + 1297^2 .

It is a cyclic number.

It is not a de Polignac number, because 13242209 - 2⁸ = 13241953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13242289) 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, 124874 + ... + 124979.

It is an arithmetic number, because the mean of its divisors is an integer number (3373029).

Almost surely, 2^13242209 is an apocalyptic number.

It is an amenable number.

13242209 is a deficient number, since it is larger than the sum of its proper divisors (249907).

13242209 is an equidigital number, since it uses as much as digits as its factorization.

13242209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249906.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 13242209 is about 3638.9846111244. The cubic root of 13242209 is about 236.5847857546.

The spelling of 13242209 in words is "thirteen million, two hundred forty-two thousand, two hundred nine".