12639547 has 2 divisors, whose sum is σ = 12639548. Its totient is φ = 12639546.

The previous prime is 12639527. The next prime is 12639559. The reversal of 12639547 is 74593621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12639547 is a prime.

It is not a weakly prime, because it can be changed into another prime (12639527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319773 + 6319774.

It is an arithmetic number, because the mean of its divisors is an integer number (6319774).

Almost surely, 2^12639547 is an apocalyptic number.

12639547 is a deficient number, since it is larger than the sum of its proper divisors (1).

12639547 is an equidigital number, since it uses as much as digits as its factorization.

12639547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 12639547 is about 3555.2140582530. The cubic root of 12639547 is about 232.9398740889.

The spelling of 12639547 in words is "twelve million, six hundred thirty-nine thousand, five hundred forty-seven".