12638705 has 8 divisors (see below), whose sum is σ = 15964800. Its totient is φ = 9578736.

The previous prime is 12638699. The next prime is 12638741. The reversal of 12638705 is 50783621.

It is a happy number.

12638705 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 de Polignac number, because none of the positive numbers 2^k-12638705 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66425 + ... + 66614.

It is an arithmetic number, because the mean of its divisors is an integer number (1995600).

Almost surely, 2^12638705 is an apocalyptic number.

It is an amenable number.

12638705 is a deficient number, since it is larger than the sum of its proper divisors (3326095).

12638705 is a wasteful number, since it uses less digits than its factorization.

12638705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133063.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 12638705 is about 3555.0956386573. The cubic root of 12638705 is about 232.9347014423.

The spelling of 12638705 in words is "twelve million, six hundred thirty-eight thousand, seven hundred five".