9998689 has 2 divisors, whose sum is σ = 9998690.
Its totient is φ = 9998688.
The previous prime is 9998641. The next prime is 9998699. The reversal of 9998689 is 9868999.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 9048064 + 950625 = 3008^2 + 975^2
It is a cyclic number.
It is not a de Polignac number, because 9998689 - 27 = 9998561 is a prime.
It is a Chen prime.
9998689 is a lucky number.
It is not a weakly prime, because it can be changed into another prime (9998699) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999344 + 4999345.
It is an arithmetic number, because the mean of its divisors is an integer number (4999345).
Almost surely, 29998689 is an apocalyptic number.
It is an amenable number.
9998689 is a deficient number, since it is larger than the sum of its proper divisors (1).
9998689 is an equidigital number, since it uses as much as digits as its factorization.
9998689 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 2519424, while the sum is 58.
The square root of 9998689 is about 3162.0703660735.
The cubic root of 9998689 is about 215.4340537121.
The spelling of 9998689 in words is "nine million, nine hundred ninety-eight thousand, six hundred eighty-nine".