998839 has 2 divisors, whose sum is σ = 998840. Its totient is φ = 998838.

The previous prime is 998831. The next prime is 998843. The reversal of 998839 is 938899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 998839 - 2³ = 998831 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499419 + 499420.

It is an arithmetic number, because the mean of its divisors is an integer number (499420).

2⁹⁹⁸⁸³⁹ is an apocalyptic number.

998839 is a deficient number, since it is larger than the sum of its proper divisors (1).

998839 is an equidigital number, since it uses as much as digits as its factorization.

998839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 46.

The square root of 998839 is about 999.4193314120. The cubic root of 998839 is about 99.9612850134.

The spelling of 998839 in words is "nine hundred ninety-eight thousand, eight hundred thirty-nine".