198139 has 2 divisors, whose sum is σ = 198140. Its totient is φ = 198138.

The previous prime is 198127. The next prime is 198173. The reversal of 198139 is 931891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198139 - 2¹³ = 189947 is a prime.

It is a super-3 number, since 3×198139³ = 23336254642078857, which contains 333 as substring.

It is a Chen prime.

198139 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 198139.

It is not a weakly prime, because it can be changed into another prime (198109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99069 + 99070.

It is an arithmetic number, because the mean of its divisors is an integer number (99070).

2¹⁹⁸¹³⁹ is an apocalyptic number.

198139 is a deficient number, since it is larger than the sum of its proper divisors (1).

198139 is an equidigital number, since it uses as much as digits as its factorization.

198139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 31.

The square root of 198139 is about 445.1280714581. The cubic root of 198139 is about 58.2984026701.

The spelling of 198139 in words is "one hundred ninety-eight thousand, one hundred thirty-nine".