8640989 has 8 divisors (see below), whose sum is σ = 9893568. Its totient is φ = 7392960.

The previous prime is 8640977. The next prime is 8641007. The reversal of 8640989 is 9890468.

8640989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 8640989 - 2⁸ = 8640733 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 (8640949) 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, 5669 + ... + 7029.

It is an arithmetic number, because the mean of its divisors is an integer number (1236696).

Almost surely, 2^8640989 is an apocalyptic number.

It is an amenable number.

8640989 is a deficient number, since it is larger than the sum of its proper divisors (1252579).

8640989 is a wasteful number, since it uses less digits than its factorization.

8640989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2275.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 8640989 is about 2939.5559188422. Note that the first 3 decimals coincide. The cubic root of 8640989 is about 205.2049427757.

The spelling of 8640989 in words is "eight million, six hundred forty thousand, nine hundred eighty-nine".