9869999 has 2 divisors, whose sum is σ = 9870000. Its totient is φ = 9869998.

The previous prime is 9869969. The next prime is 9870017. The reversal of 9869999 is 9999689.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9869999 - 2¹² = 9865903 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

9869999 is a modest number, since divided by 9999 gives 986 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9869929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4934999 + 4935000.

It is an arithmetic number, because the mean of its divisors is an integer number (4935000).

Almost surely, 2^9869999 is an apocalyptic number.

9869999 is a deficient number, since it is larger than the sum of its proper divisors (1).

9869999 is an equidigital number, since it uses as much as digits as its factorization.

9869999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2834352, while the sum is 59.

The square root of 9869999 is about 3141.6554553292. The cubic root of 9869999 is about 214.5057983700.

The spelling of 9869999 in words is "nine million, eight hundred sixty-nine thousand, nine hundred ninety-nine".