12139439 has 12 divisors (see below), whose sum is σ = 13285800. Its totient is φ = 11085984.

The previous prime is 12139417. The next prime is 12139447. The reversal of 12139439 is 93493121.

It is a de Polignac number, because none of the positive numbers 2^k-12139439 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 (12139409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18092 + ... + 18750.

It is an arithmetic number, because the mean of its divisors is an integer number (1107150).

Almost surely, 2^12139439 is an apocalyptic number.

12139439 is a deficient number, since it is larger than the sum of its proper divisors (1146361).

12139439 is a wasteful number, since it uses less digits than its factorization.

12139439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 781 counting only the distinct ones).

The product of its digits is 5832, while the sum is 32.

The square root of 12139439 is about 3484.1697719830. The cubic root of 12139439 is about 229.8262014061.

The spelling of 12139439 in words is "twelve million, one hundred thirty-nine thousand, four hundred thirty-nine".