9998279 has 2 divisors, whose sum is σ = 9998280. Its totient is φ = 9998278.

The previous prime is 9998273. The next prime is 9998281. The reversal of 9998279 is 9728999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9998279 is a prime.

Together with 9998281, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9998279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9998273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999139 + 4999140.

It is an arithmetic number, because the mean of its divisors is an integer number (4999140).

Almost surely, 2^9998279 is an apocalyptic number.

9998279 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998279 is an equidigital number, since it uses as much as digits as its factorization.

9998279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 53.

The square root of 9998279 is about 3162.0055344670. The cubic root of 9998279 is about 215.4311090204.

The spelling of 9998279 in words is "nine million, nine hundred ninety-eight thousand, two hundred seventy-nine".