198655 has 8 divisors (see below), whose sum is σ = 242352. Its totient is φ = 156288.

The previous prime is 198647. The next prime is 198659. The reversal of 198655 is 556891.

198655 = 108² + 109² + ... + 122².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198655 - 2³ = 198647 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 198655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39 + ... + 631.

It is an arithmetic number, because the mean of its divisors is an integer number (30294).

2¹⁹⁸⁶⁵⁵ is an apocalyptic number.

198655 is a deficient number, since it is larger than the sum of its proper divisors (43697).

198655 is an equidigital number, since it uses as much as digits as its factorization.

198655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665.

The product of its digits is 10800, while the sum is 34.

The square root of 198655 is about 445.7073030589. The cubic root of 198655 is about 58.3489663316.

The spelling of 198655 in words is "one hundred ninety-eight thousand, six hundred fifty-five".