8509989 has 8 divisors (see below), whose sum is σ = 11506752. Its totient is φ = 5593280.

The previous prime is 8509987. The next prime is 8509999. The reversal of 8509989 is 9899058.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8509989 - 2¹ = 8509987 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8509981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19764 + ... + 20189.

It is an arithmetic number, because the mean of its divisors is an integer number (1438344).

Almost surely, 2^8509989 is an apocalyptic number.

It is an amenable number.

8509989 is a deficient number, since it is larger than the sum of its proper divisors (2996763).

8509989 is a wasteful number, since it uses less digits than its factorization.

8509989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40027.

The product of its (nonzero) digits is 233280, while the sum is 48.

The square root of 8509989 is about 2917.1885437866. The cubic root of 8509989 is about 204.1626682173.

The spelling of 8509989 in words is "eight million, five hundred nine thousand, nine hundred eighty-nine".