9865998 has 24 divisors (see below), whose sum is σ = 22067136. Its totient is φ = 3182400.

The previous prime is 9865993. The next prime is 9866009. The reversal of 9865998 is 8995689.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9865993) 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 11 ways as a sum of consecutive naturals, for example, 8283 + ... + 9398.

It is an arithmetic number, because the mean of its divisors is an integer number (919464).

Almost surely, 2^9865998 is an apocalyptic number.

9865998 is an abundant number, since it is smaller than the sum of its proper divisors (12201138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9865998 is a wasteful number, since it uses less digits than its factorization.

9865998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17720 (or 17717 counting only the distinct ones).

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

The square root of 9865998 is about 3141.0186245866. The cubic root of 9865998 is about 214.4768097250.

The spelling of 9865998 in words is "nine million, eight hundred sixty-five thousand, nine hundred ninety-eight".