# 40

## 40 is an even composite number composed of two prime numbers multiplied together.

What does the number 40 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 8 divisors.

40 is an even composite number. It is composed of two distinct prime numbers multiplied together. It has a total of eight divisors.

## Prime factorization of 40:

### 23 × 5

(2 × 2 × 2 × 5)

See below for interesting mathematical facts about the number 40 from the Numbermatics database.

### Names of 40

• Cardinal: 40 can be written as Forty.

### Scientific notation

• Scientific notation: 4 × 101

### Factors of 40

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 7

### Divisors of 40

• Number of divisors d(n): 8
• Complete list of divisors:
• Sum of all divisors σ(n): 90
• Sum of proper divisors (its aliquot sum) s(n): 50
• 40 is an abundant number, because the sum of its proper divisors (50) is greater than itself. Its abundance is 10

### Bases of 40

• Binary: 1010002
• Base-36: 14

### Squares and roots of 40

• 40 squared (402) is 1600
• 40 cubed (403) is 64000
• The square root of 40 is 6.3245553203
• The cube root of 40 is 3.4199518931

### Scales and comparisons

How big is 40?
• A cube with a volume of 40 cubic inches would be around 0.3 feet tall.

### Recreational maths with 40

• 40 backwards is 04
• 40 is a Harshad number.
• The number of decimal digits it has is: 2
• The sum of 40's digits is 4
• More coming soon!