13205239 has 4 divisors (see below), whose sum is σ = 13527360. Its totient is φ = 12883120.

The previous prime is 13205207. The next prime is 13205249. The reversal of 13205239 is 93250231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13205239 - 2⁵ = 13205207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13205249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160999 + ... + 161080.

It is an arithmetic number, because the mean of its divisors is an integer number (3381840).

Almost surely, 2^13205239 is an apocalyptic number.

13205239 is a deficient number, since it is larger than the sum of its proper divisors (322121).

13205239 is an equidigital number, since it uses as much as digits as its factorization.

13205239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322120.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 13205239 is about 3633.9013470374. The cubic root of 13205239 is about 236.3644123562.

The spelling of 13205239 in words is "thirteen million, two hundred five thousand, two hundred thirty-nine".