197689 has 2 divisors, whose sum is σ = 197690. Its totient is φ = 197688.

The previous prime is 197683. The next prime is 197699. The reversal of 197689 is 986791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189225 + 8464 = 435^2 + 92^2 .

It is a cyclic number.

It is not a de Polignac number, because 197689 - 2¹⁷ = 66617 is a prime.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (197683) by changing a digit.

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, 98844 + 98845.

It is an arithmetic number, because the mean of its divisors is an integer number (98845).

2¹⁹⁷⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

197689 is a deficient number, since it is larger than the sum of its proper divisors (1).

197689 is an equidigital number, since it uses as much as digits as its factorization.

197689 is an odious number, because the sum of its binary digits is odd.

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

The square root of 197689 is about 444.6223116309. The cubic root of 197689 is about 58.2542347428.

The spelling of 197689 in words is "one hundred ninety-seven thousand, six hundred eighty-nine".