8638687 has 2 divisors, whose sum is σ = 8638688. Its totient is φ = 8638686.

The previous prime is 8638661. The next prime is 8638691. The reversal of 8638687 is 7868368.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8638687 is a prime.

It is a Chen prime.

8638687 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8638627) 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, 4319343 + 4319344.

It is an arithmetic number, because the mean of its divisors is an integer number (4319344).

Almost surely, 2^8638687 is an apocalyptic number.

8638687 is a deficient number, since it is larger than the sum of its proper divisors (1).

8638687 is an equidigital number, since it uses as much as digits as its factorization.

8638687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 8638687 is about 2939.1643370183. The cubic root of 8638687 is about 205.1867186375.

The spelling of 8638687 in words is "eight million, six hundred thirty-eight thousand, six hundred eighty-seven".