99839 has 2 divisors, whose sum is σ = 99840. Its totient is φ = 99838.

The previous prime is 99833. The next prime is 99859. The reversal of 99839 is 93899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99839 - 2⁴ = 99823 is a prime.

It is a super-3 number, since 3×99839³ = 2985533316380157, which contains 333 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 99839.

It is not a weakly prime, because it can be changed into another prime (99833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49919 + 49920.

It is an arithmetic number, because the mean of its divisors is an integer number (49920).

2⁹⁹⁸³⁹ is an apocalyptic number.

99839 is a deficient number, since it is larger than the sum of its proper divisors (1).

99839 is an equidigital number, since it uses as much as digits as its factorization.

99839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 38.

The square root of 99839 is about 315.9731001209. The cubic root of 99839 is about 46.3909650958.

The spelling of 99839 in words is "ninety-nine thousand, eight hundred thirty-nine".