Everything about 18

Discover a lot of information on the number 18: properties, mathematical operations, how to write it, symbolism, numerology, representations and many other interesting things!


Mathematical operations

Operations and solutions
18*2 = 36 The double of 18 is 36
18*3 = 54 The triple of 18 is 54
18/2 = 9 The half of 18 is 9.000000
18/3 = 6 The third of 18 is 6.000000
182 = 324 The square of 18 is 324.000000
183 = 5832 The cube of 18 is 5832.000000
√18 = 4.2426406871193 The square root of 18 is 4.242641
log(18) = 2.8903717578962 The natural (Neperian) logarithm of 18 is 2.890372
log10(18) = 1.2552725051033 The decimal logarithm (base 10) of 18 is 1.255273
sin(18) = -0.75098724677168 The sine of 18 is -0.750987
cos(18) = 0.66031670824408 The cosine of 18 is 0.660317
tan(18) = -1.1373137123377 The tangent of 18 is -1.137314


Mathematical representations and links

Other ways to write 18
In letter Eighteen
In roman numeral XVIII
In binary 10010
In octal 22
In hexadecimal 12
In US dollars USD 18.00 ($)
In euros 18,00 EUR (€)
Some related numbers
Previous number 17
Next number 19
Next prime number 19

How to write / spell 18 in letters?

In letters, the number 18 is written as: Eighteen. And in other languages? how does it spell?

18 in other languages
Write 18 in english Eighteen
Write 18 in french Dix-huit
Write 18 in spanish Dieciocho
Write 18 in portuguese Dezoito

Mathematical properties of 18

Questions and answers
Is 18 a prime number? No
Is 18 a perfect number? No
Number of divisors 6
List of dividers 1, 2, 3, 6, 9, 18
Sum of divisors 39

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