9998539 has 2 divisors, whose sum is σ = 9998540. Its totient is φ = 9998538.

The previous prime is 9998479. The next prime is 9998543. The reversal of 9998539 is 9358999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9998539 - 2¹¹ = 9996491 is a prime.

It is not a weakly prime, because it can be changed into another prime (9998239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999269 + 4999270.

It is an arithmetic number, because the mean of its divisors is an integer number (4999270).

Almost surely, 2^9998539 is an apocalyptic number.

9998539 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998539 is an equidigital number, since it uses as much as digits as its factorization.

9998539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 787320, while the sum is 52.

The square root of 9998539 is about 3162.0466473473. The cubic root of 9998539 is about 215.4329763952.

The spelling of 9998539 in words is "nine million, nine hundred ninety-eight thousand, five hundred thirty-nine".