198855 has 20 divisors (see below), whose sum is σ = 357192. Its totient is φ = 105840.

The previous prime is 198851. The next prime is 198859. The reversal of 198855 is 558891.

It is an interprime number because it is at equal distance from previous prime (198851) and next prime (198859).

It is not a de Polignac number, because 198855 - 2² = 198851 is a prime.

It is a super-2 number, since 2×198855² = 79086622050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198851) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 160 + ... + 650.

2¹⁹⁸⁸⁵⁵ is an apocalyptic number.

198855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

198855 is a deficient number, since it is larger than the sum of its proper divisors (158337).

198855 is an equidigital number, since it uses as much as digits as its factorization.

198855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508 (or 499 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 198855 is about 445.9316091061. The cubic root of 198855 is about 58.3685411039.

Adding to 198855 its sum of digits (36), we get a palindrome (198891).

The spelling of 198855 in words is "one hundred ninety-eight thousand, eight hundred fifty-five".