12864638 has 8 divisors (see below), whose sum is σ = 19355232. Its totient is φ = 6412896.

The previous prime is 12864623. The next prime is 12864667. The reversal of 12864638 is 83646821.

It is a happy number.

12864638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8870 + ... + 10217.

It is an arithmetic number, because the mean of its divisors is an integer number (2419404).

Almost surely, 2^12864638 is an apocalyptic number.

12864638 is a deficient number, since it is larger than the sum of its proper divisors (6490594).

12864638 is a wasteful number, since it uses less digits than its factorization.

12864638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19426.

The product of its digits is 55296, while the sum is 38.

The square root of 12864638 is about 3586.7308234658. The cubic root of 12864638 is about 234.3145136476.

The spelling of 12864638 in words is "twelve million, eight hundred sixty-four thousand, six hundred thirty-eight".