12791239 has 4 divisors (see below), whose sum is σ = 12806640. Its totient is φ = 12775840.

The previous prime is 12791231. The next prime is 12791249. The reversal of 12791239 is 93219721.

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 12791239 - 2³ = 12791231 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 (12791231) 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, 6379 + ... + 8140.

It is an arithmetic number, because the mean of its divisors is an integer number (3201660).

Almost surely, 2^12791239 is an apocalyptic number.

12791239 is a deficient number, since it is larger than the sum of its proper divisors (15401).

12791239 is an equidigital number, since it uses as much as digits as its factorization.

12791239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15400.

The product of its digits is 6804, while the sum is 34.

The square root of 12791239 is about 3576.4841674471. The cubic root of 12791239 is about 233.8680374607.

The spelling of 12791239 in words is "twelve million, seven hundred ninety-one thousand, two hundred thirty-nine".