12805239 has 4 divisors (see below), whose sum is σ = 17073656. Its totient is φ = 8536824.

The previous prime is 12805237. The next prime is 12805279. The reversal of 12805239 is 93250821.

It is a happy number.

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

It is not a de Polignac number, because 12805239 - 2¹ = 12805237 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 (12805237) 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, 2134204 + ... + 2134209.

It is an arithmetic number, because the mean of its divisors is an integer number (4268414).

Almost surely, 2^12805239 is an apocalyptic number.

12805239 is a deficient number, since it is larger than the sum of its proper divisors (4268417).

12805239 is an equidigital number, since it uses as much as digits as its factorization.

12805239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4268416.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 12805239 is about 3578.4408616044. The cubic root of 12805239 is about 233.9533291391.

The spelling of 12805239 in words is "twelve million, eight hundred five thousand, two hundred thirty-nine".