198665443 has 4 divisors (see below), whose sum is σ = 198724648. Its totient is φ = 198606240.

The previous prime is 198665431. The next prime is 198665491. The reversal of 198665443 is 344566891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344566891 = 31 ⋅11115061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198665443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198665393 and 198665402.

It is not an unprimeable number, because it can be changed into a prime (198605443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24246 + ... + 31387.

It is an arithmetic number, because the mean of its divisors is an integer number (49681162).

Almost surely, 2^198665443 is an apocalyptic number.

198665443 is a deficient number, since it is larger than the sum of its proper divisors (59205).

198665443 is an equidigital number, since it uses as much as digits as its factorization.

198665443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59204.

The product of its digits is 622080, while the sum is 46.

The square root of 198665443 is about 14094.8729330917. The cubic root of 198665443 is about 583.4998875336.

The spelling of 198665443 in words is "one hundred ninety-eight million, six hundred sixty-five thousand, four hundred forty-three".