12663859 has 4 divisors (see below), whose sum is σ = 13638016. Its totient is φ = 11689704.

The previous prime is 12663829. The next prime is 12663877. The reversal of 12663859 is 95836621.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12663859 - 2²³ = 4275251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12663809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487059 + ... + 487084.

It is an arithmetic number, because the mean of its divisors is an integer number (3409504).

Almost surely, 2^12663859 is an apocalyptic number.

12663859 is a deficient number, since it is larger than the sum of its proper divisors (974157).

12663859 is an equidigital number, since it uses as much as digits as its factorization.

12663859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974156.

The product of its digits is 77760, while the sum is 40.

The square root of 12663859 is about 3558.6316190356. The cubic root of 12663859 is about 233.0891306787.

The spelling of 12663859 in words is "twelve million, six hundred sixty-three thousand, eight hundred fifty-nine".