9998440999 has 2 divisors, whose sum is σ = 9998441000. Its totient is φ = 9998440998.

The previous prime is 9998440993. The next prime is 9998441111. The reversal of 9998440999 is 9990448999.

9998440999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (9990448999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9998440999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9998440993) 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, 4999220499 + 4999220500.

It is an arithmetic number, because the mean of its divisors is an integer number (4999220500).

Almost surely, 2^9998440999 is an apocalyptic number.

9998440999 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998440999 is an equidigital number, since it uses as much as digits as its factorization.

9998440999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68024448, while the sum is 70.

The square root of 9998440999 is about 99992.2046911658. The cubic root of 9998440999 is about 2154.3227253520.

The spelling of 9998440999 in words is "nine billion, nine hundred ninety-eight million, four hundred forty thousand, nine hundred ninety-nine".