12638947 has 16 divisors (see below), whose sum is σ = 13571712. Its totient is φ = 11753280.

The previous prime is 12638909. The next prime is 12638953. The reversal of 12638947 is 74983621.

12638947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12638947 - 2¹⁵ = 12606179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12638957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118068 + ... + 118174.

It is an arithmetic number, because the mean of its divisors is an integer number (848232).

Almost surely, 2^12638947 is an apocalyptic number.

12638947 is a deficient number, since it is larger than the sum of its proper divisors (932765).

12638947 is a wasteful number, since it uses less digits than its factorization.

12638947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258.

The product of its digits is 72576, while the sum is 40.

The square root of 12638947 is about 3555.1296741469. The cubic root of 12638947 is about 232.9361881410.

The spelling of 12638947 in words is "twelve million, six hundred thirty-eight thousand, nine hundred forty-seven".