197998 has 4 divisors (see below), whose sum is σ = 297000. Its totient is φ = 98998.

The previous prime is 197971. The next prime is 198013. The reversal of 197998 is 899791.

197998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

197998 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49498 + ... + 49501.

It is an arithmetic number, because the mean of its divisors is an integer number (74250).

2¹⁹⁷⁹⁹⁸ is an apocalyptic number.

197998 is a deficient number, since it is larger than the sum of its proper divisors (99002).

197998 is an equidigital number, since it uses as much as digits as its factorization.

197998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99001.

The product of its digits is 40824, while the sum is 43.

The square root of 197998 is about 444.9696618872. The cubic root of 197998 is about 58.2845705868.

The spelling of 197998 in words is "one hundred ninety-seven thousand, nine hundred ninety-eight".