8639987 has 2 divisors, whose sum is σ = 8639988. Its totient is φ = 8639986.

The previous prime is 8639977. The next prime is 8640001. The reversal of 8639987 is 7899368.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8639987 - 2⁶ = 8639923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8639977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4319993 + 4319994.

It is an arithmetic number, because the mean of its divisors is an integer number (4319994).

Almost surely, 2^8639987 is an apocalyptic number.

8639987 is a deficient number, since it is larger than the sum of its proper divisors (1).

8639987 is an equidigital number, since it uses as much as digits as its factorization.

8639987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 8639987 is about 2939.3854799941. The cubic root of 8639987 is about 205.1970106859.

The spelling of 8639987 in words is "eight million, six hundred thirty-nine thousand, nine hundred eighty-seven".