9865989 has 16 divisors (see below), whose sum is σ = 16704640. Its totient is φ = 5637600.

The previous prime is 9865979. The next prime is 9865993. The reversal of 9865989 is 9895689.

It is not a de Polignac number, because 9865989 - 2⁸ = 9865733 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9865949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25912 + ... + 26289.

It is an arithmetic number, because the mean of its divisors is an integer number (1044040).

Almost surely, 2^9865989 is an apocalyptic number.

It is an amenable number.

9865989 is a deficient number, since it is larger than the sum of its proper divisors (6838651).

9865989 is a wasteful number, since it uses less digits than its factorization.

9865989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52217 (or 52211 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

The square root of 9865989 is about 3141.0171919300. The cubic root of 9865989 is about 214.4767445080.

The spelling of 9865989 in words is "nine million, eight hundred sixty-five thousand, nine hundred eighty-nine".