12439805 has 16 divisors (see below), whose sum is σ = 17189760. Its totient is φ = 8465472.

The previous prime is 12439783. The next prime is 12439829. The reversal of 12439805 is 50893421.

12439805 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12439805 - 2⁸ = 12439549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3587 + ... + 6143.

It is an arithmetic number, because the mean of its divisors is an integer number (1074360).

Almost surely, 2^12439805 is an apocalyptic number.

It is an amenable number.

12439805 is a deficient number, since it is larger than the sum of its proper divisors (4749955).

12439805 is a wasteful number, since it uses less digits than its factorization.

12439805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 12439805 is about 3527.0107740125. The cubic root of 12439805 is about 231.7063081644.

The spelling of 12439805 in words is "twelve million, four hundred thirty-nine thousand, eight hundred five".