8639689 has 16 divisors (see below), whose sum is σ = 9580032. Its totient is φ = 7757568.

The previous prime is 8639663. The next prime is 8639711. The reversal of 8639689 is 9869368.

It is a cyclic number.

It is not a de Polignac number, because 8639689 - 2⁹ = 8639177 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8639639) 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 15 ways as a sum of consecutive naturals, for example, 38632 + ... + 38854.

It is an arithmetic number, because the mean of its divisors is an integer number (598752).

Almost surely, 2^8639689 is an apocalyptic number.

It is an amenable number.

8639689 is a deficient number, since it is larger than the sum of its proper divisors (940343).

8639689 is a wasteful number, since it uses less digits than its factorization.

8639689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336.

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

The square root of 8639689 is about 2939.3347886894. The cubic root of 8639689 is about 205.1946515230.

The spelling of 8639689 in words is "eight million, six hundred thirty-nine thousand, six hundred eighty-nine".