9998239 has 2 divisors, whose sum is σ = 9998240. Its totient is φ = 9998238.

The previous prime is 9998207. The next prime is 9998249. The reversal of 9998239 is 9328999.

It is a strong prime.

It is an emirp because it is prime and its reverse (9328999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9998239 - 2⁵ = 9998207 is a prime.

It is a super-2 number, since 2×9998239² = 199929566202242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9998192 and 9998201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9998249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999119 + 4999120.

It is an arithmetic number, because the mean of its divisors is an integer number (4999120).

Almost surely, 2^9998239 is an apocalyptic number.

9998239 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998239 is an equidigital number, since it uses as much as digits as its factorization.

9998239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 49.

The square root of 9998239 is about 3161.9992093611. Note that the first 3 decimals coincide. The cubic root of 9998239 is about 215.4308217291.

The spelling of 9998239 in words is "nine million, nine hundred ninety-eight thousand, two hundred thirty-nine".