12939239 has 4 divisors (see below), whose sum is σ = 13033824. Its totient is φ = 12844656.

The previous prime is 12939217. The next prime is 12939257. The reversal of 12939239 is 93293921.

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 12939239 - 2⁸ = 12938983 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 (12939739) 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, 47087 + ... + 47360.

It is an arithmetic number, because the mean of its divisors is an integer number (3258456).

Almost surely, 2^12939239 is an apocalyptic number.

12939239 is a deficient number, since it is larger than the sum of its proper divisors (94585).

12939239 is an equidigital number, since it uses as much as digits as its factorization.

12939239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94584.

The product of its digits is 26244, while the sum is 38.

The square root of 12939239 is about 3597.1153720725. The cubic root of 12939239 is about 234.7665646344.

The spelling of 12939239 in words is "twelve million, nine hundred thirty-nine thousand, two hundred thirty-nine".