8639986 has 4 divisors (see below), whose sum is σ = 12959982. Its totient is φ = 4319992.

The previous prime is 8639977. The next prime is 8639987. The reversal of 8639986 is 6899368.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6095961 + 2544025 = 2469^2 + 1595^2 .

It is not an unprimeable number, because it can be changed into a prime (8639987) 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, 2159995 + ... + 2159998.

Almost surely, 2^8639986 is an apocalyptic number.

8639986 is a deficient number, since it is larger than the sum of its proper divisors (4319996).

8639986 is a wasteful number, since it uses less digits than its factorization.

8639986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4319995.

The product of its digits is 559872, while the sum is 49.

The square root of 8639986 is about 2939.3853098905. The cubic root of 8639986 is about 205.1970027694.

The spelling of 8639986 in words is "eight million, six hundred thirty-nine thousand, nine hundred eighty-six".