198769 has 2 divisors, whose sum is σ = 198770. Its totient is φ = 198768.

The previous prime is 198761. The next prime is 198811. The reversal of 198769 is 967891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129600 + 69169 = 360^2 + 263^2 .

It is a cyclic number.

It is not a de Polignac number, because 198769 - 2³ = 198761 is a prime.

It is a super-2 number, since 2×198769² = 79018230722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (198761) 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, 99384 + 99385.

It is an arithmetic number, because the mean of its divisors is an integer number (99385).

2¹⁹⁸⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

198769 is a deficient number, since it is larger than the sum of its proper divisors (1).

198769 is an equidigital number, since it uses as much as digits as its factorization.

198769 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 198769 is about 445.8351713358. The cubic root of 198769 is about 58.3601255611.

The spelling of 198769 in words is "one hundred ninety-eight thousand, seven hundred sixty-nine".