198668 has 6 divisors (see below), whose sum is σ = 347676. Its totient is φ = 99332.

The previous prime is 198659. The next prime is 198673. The reversal of 198668 is 866891.

It is an unprimeable number.

198668 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, 24830 + ... + 24837.

It is an arithmetic number, because the mean of its divisors is an integer number (57946).

2¹⁹⁸⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

198668 is a deficient number, since it is larger than the sum of its proper divisors (149008).

198668 is a wasteful number, since it uses less digits than its factorization.

198668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49671 (or 49669 counting only the distinct ones).

The product of its digits is 20736, while the sum is 38.

The square root of 198668 is about 445.7218863821. The cubic root of 198668 is about 58.3502390909.

The spelling of 198668 in words is "one hundred ninety-eight thousand, six hundred sixty-eight".