It is a semiprime because it is the product of two primes.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 159998.
It is an unprimeable number.
2159998 is an apocalyptic number.
159998 is an equidigital number, since it uses as much as digits as its factorization.
159998 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 80001.
The square root of 159998 is about 399.9974999922. The cubic root of 159998 is about 54.2881261295.
The spelling of 159998 in words is "one hundred fifty-nine thousand, nine hundred ninety-eight".