# 4

## 4 is an even composite number. It is composed of a single prime number multiplied by itself.

What does the number 4 look like?

This visualization shows the relationship between its 1 prime factors (large circles) and 3 divisors.

4 is an even composite number. It has a total of three divisors.

## Prime factorization of 4:

### 22

(2 × 2)

See below for interesting mathematical facts about the number 4 from the Numbermatics database.

### Names of 4

• Cardinal: 4 can be written as Four.

### Scientific notation

• Scientific notation: 4 × 100

### Factors of 4

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 2

### Divisors of 4

• Number of divisors d(n): 3
• Complete list of divisors:
• Sum of all divisors σ(n): 7
• Sum of proper divisors (its aliquot sum) s(n): 3
• 4 is a deficient number, because the sum of its proper divisors (3) is less than itself. Its deficiency is 1

• Binary: 1002
• Base-36: 4

### Squares and roots of 4

• 4 squared (42) is 16
• 4 cubed (43) is 64
• 4 is a perfect square number. Its square root is 2
• The cube root of 4 is 1.5874010519

### Scales and comparisons

How big is 4?
• A cube with a volume of 4 cubic inches would be around 0.1 feet tall.

### Recreational maths with 4

• 4 is the same when its digits are reversed! That makes it a palindromic number.
• 4 is a Harshad number.
• The number of decimal digits it has is: 1
• The sum of 4's digits is 4
• More coming soon!

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The information we have on file for 4 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

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