Properties of the Number 198

One Hundred Ninety-Eight

Basics

Value: 197 → 198 → 199

Parity: even

Prime: No

Previous Prime: 197

Next Prime: 199

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 11

Divisors: 1, 2, 3, 6, 9, 11, 18, 22, 33, 66

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 11000110

Octal: 306

Duodecimal: 146

Hexadecimal: c6

Square: 39204

Square Root: 14.071247279470288

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Abundant numbers (sum of divisors of m exceeds 2m). A5101

Average of twin prime pairs. A14574

a(n) = prime(n) - 1. A6093

Niven (or Harshad, or harshad) numbers: numbers that are divisible by the sum of their digits. A5349

a(n) = ∑_k=1..n floor(n/k); also ∑_k=1..n d(k), where d = number of divisors (A000005); also number of solutions to x·y = z with 1 <= x,y,z <= n. A6218

Positive integers congruent to 2 (mod 4): a(n) = 4·n+2, for n >= 0. A16825

a(n) = prime(n) + 1. A8864

Practical numbers: positive integers m such that every k <= σ(m) is a sum of distinct divisors of m. Also called panarithmic numbers. A5153

Numbers that are the sum of 2 successive primes. A1043

Companion Pell numbers: a(n) = 2·a(n-1) + a(n-2), a(0) = a(1) = 2. A2203

We use cookies

Some cookies are essential for Natory to function, like keeping you signed in. We also use optional cookies to understand how the app is used and improve it over time. Learn more in our Privacy Policy. You can manage your preferences anytime.