12638851 has 4 divisors (see below), whose sum is σ = 12722704. Its totient is φ = 12555000.

The previous prime is 12638849. The next prime is 12638893. The reversal of 12638851 is 15883621.

12638851 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 12638851 - 2¹ = 12638849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12638251) 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, 41700 + ... + 42001.

It is an arithmetic number, because the mean of its divisors is an integer number (3180676).

Almost surely, 2^12638851 is an apocalyptic number.

12638851 is a deficient number, since it is larger than the sum of its proper divisors (83853).

12638851 is an equidigital number, since it uses as much as digits as its factorization.

12638851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83852.

The product of its digits is 11520, while the sum is 34.

The square root of 12638851 is about 3555.1161725041. The cubic root of 12638851 is about 232.9355983785.

The spelling of 12638851 in words is "twelve million, six hundred thirty-eight thousand, eight hundred fifty-one".