12947239 has 4 divisors (see below), whose sum is σ = 12995640. Its totient is φ = 12898840.

The previous prime is 12947237. The next prime is 12947261. The reversal of 12947239 is 93274921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93274921 = 67 ⋅1392163.

It is a cyclic number.

It is not a de Polignac number, because 12947239 - 2¹ = 12947237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12947198 and 12947207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12947237) 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, 23797 + ... + 24334.

It is an arithmetic number, because the mean of its divisors is an integer number (3248910).

Almost surely, 2^12947239 is an apocalyptic number.

12947239 is a deficient number, since it is larger than the sum of its proper divisors (48401).

12947239 is an equidigital number, since it uses as much as digits as its factorization.

12947239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48400.

The product of its digits is 27216, while the sum is 37.

The square root of 12947239 is about 3598.2272023873. The cubic root of 12947239 is about 234.8149380507.

The spelling of 12947239 in words is "twelve million, nine hundred forty-seven thousand, two hundred thirty-nine".