12806639 has 4 divisors (see below), whose sum is σ = 12833424. Its totient is φ = 12779856.

The previous prime is 12806621. The next prime is 12806641. The reversal of 12806639 is 93660821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93660821 = 911 ⋅102811.

It is a cyclic number.

It is not a de Polignac number, because 12806639 - 2⁸ = 12806383 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12806599 and 12806608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12806939) 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, 12662 + ... + 13635.

It is an arithmetic number, because the mean of its divisors is an integer number (3208356).

Almost surely, 2^12806639 is an apocalyptic number.

12806639 is a deficient number, since it is larger than the sum of its proper divisors (26785).

12806639 is an equidigital number, since it uses as much as digits as its factorization.

12806639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26784.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 12806639 is about 3578.6364721776. The cubic root of 12806639 is about 233.9618548872.

The spelling of 12806639 in words is "twelve million, eight hundred six thousand, six hundred thirty-nine".