12805039 has 4 divisors (see below), whose sum is σ = 13790056. Its totient is φ = 11820024.

The previous prime is 12805033. The next prime is 12805049. The reversal of 12805039 is 93050821.

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 12805039 - 2⁵ = 12805007 is a prime.

It is a super-3 number, since 3×12805039³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12804998 and 12805016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12805033) 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, 492489 + ... + 492514.

It is an arithmetic number, because the mean of its divisors is an integer number (3447514).

Almost surely, 2^12805039 is an apocalyptic number.

12805039 is a deficient number, since it is larger than the sum of its proper divisors (985017).

12805039 is an equidigital number, since it uses as much as digits as its factorization.

12805039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985016.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 12805039 is about 3578.4129163639. The cubic root of 12805039 is about 233.9521111244.

The spelling of 12805039 in words is "twelve million, eight hundred five thousand, thirty-nine".