199998 has 24 divisors (see below), whose sum is σ = 445536. Its totient is φ = 64800.

The previous prime is 199967. The next prime is 199999. The reversal of 199998 is 899991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 603 + ... + 873.

It is an arithmetic number, because the mean of its divisors is an integer number (18564).

2¹⁹⁹⁹⁹⁸ is an apocalyptic number.

199998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

199998 is an abundant number, since it is smaller than the sum of its proper divisors (245538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199998 is a wasteful number, since it uses less digits than its factorization.

199998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 317 counting only the distinct ones).

The product of its digits is 52488, while the sum is 45.

The square root of 199998 is about 447.2113594264. The cubic root of 199998 is about 58.4801598291.

It can be divided in two parts, 1 and 99998, that added together give a palindrome (99999).

The spelling of 199998 in words is "one hundred ninety-nine thousand, nine hundred ninety-eight".