199839 has 8 divisors (see below), whose sum is σ = 275760. Its totient is φ = 128576.

The previous prime is 199831. The next prime is 199853. The reversal of 199839 is 938991.

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

It is a cyclic number.

It is not a de Polignac number, because 199839 - 2³ = 199831 is a prime.

199839 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 199797 and 199806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199831) 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, 1062 + ... + 1235.

It is an arithmetic number, because the mean of its divisors is an integer number (34470).

2¹⁹⁹⁸³⁹ is an apocalyptic number.

199839 is a deficient number, since it is larger than the sum of its proper divisors (75921).

199839 is a wasteful number, since it uses less digits than its factorization.

199839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329.

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

The square root of 199839 is about 447.0335557875. The cubic root of 199839 is about 58.4646583231.

The spelling of 199839 in words is "one hundred ninety-nine thousand, eight hundred thirty-nine".