12638859 has 8 divisors (see below), whose sum is σ = 16868352. Its totient is φ = 8417640.

The previous prime is 12638849. The next prime is 12638893. The reversal of 12638859 is 95883621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12638859 - 2⁵ = 12638827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12638859.

It is not an unprimeable number, because it can be changed into a prime (12638839) 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 7 ways as a sum of consecutive naturals, for example, 4314 + ... + 6624.

It is an arithmetic number, because the mean of its divisors is an integer number (2108544).

Almost surely, 2^12638859 is an apocalyptic number.

12638859 is a deficient number, since it is larger than the sum of its proper divisors (4229493).

12638859 is a wasteful number, since it uses less digits than its factorization.

12638859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4137.

The product of its digits is 103680, while the sum is 42.

The square root of 12638859 is about 3555.1172976429. The cubic root of 12638859 is about 232.9356475255.

The spelling of 12638859 in words is "twelve million, six hundred thirty-eight thousand, eight hundred fifty-nine".