198939 has 8 divisors (see below), whose sum is σ = 285712. Its totient is φ = 122400.

The previous prime is 198937. The next prime is 198941. The reversal of 198939 is 939891.

It is an interprime number because it is at equal distance from previous prime (198937) and next prime (198941).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198939 - 2¹ = 198937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 5101 = 198939 / (1 + 9 + 8 + 9 + 3 + 9).

It is a Duffinian number.

It is a plaindrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 198897 and 198906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2512 + ... + 2589.

It is an arithmetic number, because the mean of its divisors is an integer number (35714).

2¹⁹⁸⁹³⁹ is an apocalyptic number.

198939 is a deficient number, since it is larger than the sum of its proper divisors (86773).

198939 is a wasteful number, since it uses less digits than its factorization.

198939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5117.

The product of its digits is 17496, while the sum is 39.

The square root of 198939 is about 446.0257840081. The cubic root of 198939 is about 58.3767585945.

The spelling of 198939 in words is "one hundred ninety-eight thousand, nine hundred thirty-nine".