197698 has 4 divisors (see below), whose sum is σ = 296550. Its totient is φ = 98848.

The previous prime is 197689. The next prime is 197699. The reversal of 197698 is 896791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 896791 = 7 ⋅128113.

It can be written as a sum of positive squares in only one way, i.e., 178929 + 18769 = 423^2 + 137^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 197698.

It is not an unprimeable number, because it can be changed into a prime (197699) by changing a digit.

197698 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49423 + ... + 49426.

2¹⁹⁷⁶⁹⁸ is an apocalyptic number.

197698 is a deficient number, since it is larger than the sum of its proper divisors (98852).

197698 is an equidigital number, since it uses as much as digits as its factorization.

197698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98851.

The product of its digits is 27216, while the sum is 40.

The square root of 197698 is about 444.6324324653. The cubic root of 197698 is about 58.2551187579.

The spelling of 197698 in words is "one hundred ninety-seven thousand, six hundred ninety-eight".