12638747 has 4 divisors (see below), whose sum is σ = 13787736. Its totient is φ = 11489760.

The previous prime is 12638741. The next prime is 12638761. The reversal of 12638747 is 74783621.

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 12638747 - 2⁶ = 12638683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12638747.

It is not an unprimeable number, because it can be changed into a prime (12638741) 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 3 ways as a sum of consecutive naturals, for example, 574478 + ... + 574499.

It is an arithmetic number, because the mean of its divisors is an integer number (3446934).

Almost surely, 2^12638747 is an apocalyptic number.

12638747 is a deficient number, since it is larger than the sum of its proper divisors (1148989).

12638747 is a wasteful number, since it uses less digits than its factorization.

12638747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148988.

The product of its digits is 56448, while the sum is 38.

The square root of 12638747 is about 3555.1015456665. The cubic root of 12638747 is about 232.9349594658.

The spelling of 12638747 in words is "twelve million, six hundred thirty-eight thousand, seven hundred forty-seven".