9866999 has 2 divisors, whose sum is σ = 9867000. Its totient is φ = 9866998.

The previous prime is 9866981. The next prime is 9867037. The reversal of 9866999 is 9996689.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9866999 - 2²⁰ = 8818423 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9866599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4933499 + 4933500.

It is an arithmetic number, because the mean of its divisors is an integer number (4933500).

Almost surely, 2^9866999 is an apocalyptic number.

9866999 is a deficient number, since it is larger than the sum of its proper divisors (1).

9866999 is an equidigital number, since it uses as much as digits as its factorization.

9866999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 56.

The square root of 9866999 is about 3141.1779637582. The cubic root of 9866999 is about 214.4840630553.

The spelling of 9866999 in words is "nine million, eight hundred sixty-six thousand, nine hundred ninety-nine".