189998 has 4 divisors (see below), whose sum is σ = 285000. Its totient is φ = 94998.

The previous prime is 189997. The next prime is 190027. The reversal of 189998 is 899981.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

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 189998.

It is not an unprimeable number, because it can be changed into a prime (189997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47498 + ... + 47501.

It is an arithmetic number, because the mean of its divisors is an integer number (71250).

2¹⁸⁹⁹⁹⁸ is an apocalyptic number.

189998 is a deficient number, since it is larger than the sum of its proper divisors (95002).

189998 is an equidigital number, since it uses as much as digits as its factorization.

189998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95001.

The product of its digits is 46656, while the sum is 44.

The square root of 189998 is about 435.8876001907. The cubic root of 189998 is about 57.4887690731.

The spelling of 189998 in words is "one hundred eighty-nine thousand, nine hundred ninety-eight".