198439 has 2 divisors, whose sum is σ = 198440. Its totient is φ = 198438.

The previous prime is 198437. The next prime is 198461. The reversal of 198439 is 934891.

198439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (934891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198439 - 2¹ = 198437 is a prime.

Together with 198437, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99219 + 99220.

It is an arithmetic number, because the mean of its divisors is an integer number (99220).

2¹⁹⁸⁴³⁹ is an apocalyptic number.

198439 is a deficient number, since it is larger than the sum of its proper divisors (1).

198439 is an equidigital number, since it uses as much as digits as its factorization.

198439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 198439 is about 445.4649256676. The cubic root of 198439 is about 58.3278108151.

The spelling of 198439 in words is "one hundred ninety-eight thousand, four hundred thirty-nine".