13839209 has 4 divisors (see below), whose sum is σ = 13848900. Its totient is φ = 13829520.

The previous prime is 13839191. The next prime is 13839229. The reversal of 13839209 is 90293831.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90293831 = 1291 ⋅69941.

It can be written as a sum of positive squares in 2 ways, for example, as 2088025 + 11751184 = 1445^2 + 3428^2 .

It is a cyclic number.

It is not a de Polignac number, because 13839209 - 2⁸ = 13838953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (13839229) 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 3 ways as a sum of consecutive naturals, for example, 2234 + ... + 5715.

It is an arithmetic number, because the mean of its divisors is an integer number (3462225).

Almost surely, 2^13839209 is an apocalyptic number.

It is an amenable number.

13839209 is a deficient number, since it is larger than the sum of its proper divisors (9691).

13839209 is an equidigital number, since it uses as much as digits as its factorization.

13839209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9690.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 13839209 is about 3720.1087349700. The cubic root of 13839209 is about 240.0879827883.

The spelling of 13839209 in words is "thirteen million, eight hundred thirty-nine thousand, two hundred nine".