9998999827 has 2 divisors, whose sum is σ = 9998999828. Its totient is φ = 9998999826.

The previous prime is 9998999761. The next prime is 9998999849. The reversal of 9998999827 is 7289998999.

9998999827 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (7289998999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9998999827 - 2¹⁵ = 9998967059 is a prime.

It is not a weakly prime, because it can be changed into another prime (9998999867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999499913 + 4999499914.

It is an arithmetic number, because the mean of its divisors is an integer number (4999499914).

Almost surely, 2^9998999827 is an apocalyptic number.

9998999827 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998999827 is an equidigital number, since it uses as much as digits as its factorization.

9998999827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476171136, while the sum is 79.

The square root of 9998999827 is about 99994.9990099505. Note that the first 3 decimals coincide. The cubic root of 9998999827 is about 2154.3628607235.

The spelling of 9998999827 in words is "nine billion, nine hundred ninety-eight million, nine hundred ninety-nine thousand, eight hundred twenty-seven".