# Number 18

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## Description of the number 18

18 is a natural number (hence integer, rational and real) of 2 digits that follows 17 and precedes 19.

18 is an even number, since it is divisible by 2.

The number 18 is a unique number, with its own characteristics that, for some reason, has caught your attention. It is logical, we use numbers every day, in multiple ways and almost without realizing it, but knowing more about the number 18 can help you benefit from that knowledge, and be of great use. If you keep reading, we will give you all the facts you need to know about the number 18, you will see how many of them you already knew, but we are sure you will also discover some new ones.

## how to write 18 in letters?

Number 18 in English is written aseighteen
The number 18 is pronounced digit by digit as (1) one (8) eight.

## What are the divisors of 18?

The number 18 has 6 divisors, they are as follows:

The sum of its divisors, excluding the number itself is 21, so it is an abundant number and its abundance is 3

## Is 18 a prime number?

No, 18 is not a prime number since it has more divisors than 1 and the number itself

## What are the prime factors of 18?

The factorization into prime factors of 18 is:

21*32

## What is the square root of 18?

The square root of 18 is. 4.2426406871193

## What is the square of 18?

The square of 18, the result of multiplying 18*18 is. 324

## How to convert 18 to binary numbers?

The decimal number 18 into binary numbers is.10010

## How to convert 18 to octal?

The decimal number 18 in octal numbers is22

## How to convert 18 to hexadecimal?

The decimal number 18 in hexadecimal numbers is12

## What is the natural or neperian logarithm of 18?

The neperian or natural logarithm of 18 is.2.8903717578962

## What is the base 10 logarithm of 18?

The base 10 logarithm of 18 is1.2552725051033

## What are the trigonometric properties of 18?

### What is the sine of 18?

The sine of 18 radians is.-0.75098724677168

### What is the cosine of 18?

The cosine of 18 radians is. 0.66031670824408

### What is the tangent of 18?

The tangent of 18 radians is.-1.1373137123377

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