12439789 has 4 divisors (see below), whose sum is σ = 12674556. Its totient is φ = 12205024.

The previous prime is 12439783. The next prime is 12439829. The reversal of 12439789 is 98793421.

12439789 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6461764 + 5978025 = 2542^2 + 2445^2 .

It is a cyclic number.

It is not a de Polignac number, because 12439789 - 2¹³ = 12431597 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 (12439783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117304 + ... + 117409.

It is an arithmetic number, because the mean of its divisors is an integer number (3168639).

Almost surely, 2^12439789 is an apocalyptic number.

It is an amenable number.

12439789 is a deficient number, since it is larger than the sum of its proper divisors (234767).

12439789 is an equidigital number, since it uses as much as digits as its factorization.

12439789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234766.

The product of its digits is 108864, while the sum is 43.

The square root of 12439789 is about 3527.0085058020. The cubic root of 12439789 is about 231.7062088246.

The spelling of 12439789 in words is "twelve million, four hundred thirty-nine thousand, seven hundred eighty-nine".