198 (number)

← 197 198 199 →
← 190 191 192 193 194 195 196 197 198 199 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred ninety-eight
Ordinal	198th (one hundred ninety-eighth)
Factorization	2 × 32 × 11
Divisors	1, 2, 3, 6, 9, 11, 18, 22, 33, 66, 99, 198
Greek numeral	ΡϞΗ´
Roman numeral	CXCVIII, cxcviii
Binary	110001102
Ternary	211003
Senary	5306
Octal	3068
Duodecimal	14612
Hexadecimal	C616

198 (one hundred [and] ninety-eight) is the natural number following 197 and preceding 199.

In mathematics

• 198 is the smallest number that can be written as a sum of four positive squares in ten different ways.
• There are 198 positive palindromic numbers under 10,000.
• 198 is a Harshad number since the sum of the digits is 18, and $198/18=11$ which the sum is a whole number.
• 198 is a Pell–Lucas number. Its corresponding Pell number is 70.
• 198 is a practical number, and a 5-tuple of practical numbers.
• 198 is the only number such that it equals the sum of its digits times 1.1.

In other fields

• 198 is the number of ridges on a U.S. dollar coin.