197798 has 4 divisors (see below), whose sum is σ = 296700. Its totient is φ = 98898.

The previous prime is 197779. The next prime is 197803. The reversal of 197798 is 897791.

197798 is digitally balanced in base 3, 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, and also an emirpimes, since its reverse is a distinct semiprime: 897791 = 31 ⋅28961.

It is a Curzon number.

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49448 + ... + 49451.

It is an arithmetic number, because the mean of its divisors is an integer number (74175).

2¹⁹⁷⁷⁹⁸ is an apocalyptic number.

197798 is a deficient number, since it is larger than the sum of its proper divisors (98902).

197798 is an equidigital number, since it uses as much as digits as its factorization.

197798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98901.

The product of its digits is 31752, while the sum is 41.

The square root of 197798 is about 444.7448706843. The cubic root of 197798 is about 58.2649393427.

The spelling of 197798 in words is "one hundred ninety-seven thousand, seven hundred ninety-eight".