13205939 has 4 divisors (see below), whose sum is σ = 13334256. Its totient is φ = 13077624.

The previous prime is 13205891. The next prime is 13205953. The reversal of 13205939 is 93950231.

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 13205939 - 2⁸ = 13205683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13205989) 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, 64004 + ... + 64209.

It is an arithmetic number, because the mean of its divisors is an integer number (3333564).

Almost surely, 2^13205939 is an apocalyptic number.

13205939 is a deficient number, since it is larger than the sum of its proper divisors (128317).

13205939 is a wasteful number, since it uses less digits than its factorization.

13205939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128316.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 13205939 is about 3633.9976609789. The cubic root of 13205939 is about 236.3685887836.

The spelling of 13205939 in words is "thirteen million, two hundred five thousand, nine hundred thirty-nine".