# 393

## 393 is an odd composite number composed of two prime numbers multiplied together.

What does the number 393 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

393 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

## Prime factorization of 393:

### 3 × 131

See below for interesting mathematical facts about the number 393 from the Numbermatics database.

### Names of 393

• Cardinal: 393 can be written as Three hundred ninety-three.

### Scientific notation

• Scientific notation: 3.93 × 102

### Factors of 393

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 134

### Divisors of 393

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 528
• Sum of proper divisors (its aliquot sum) s(n): 135
• 393 is a deficient number, because the sum of its proper divisors (135) is less than itself. Its deficiency is 258

### Bases of 393

• Binary: 1100010012
• Base-36: AX

### Squares and roots of 393

• 393 squared (3932) is 154449
• 393 cubed (3933) is 60698457
• The square root of 393 is 19.8242276013
• The cube root of 393 is 7.3248294445

### Scales and comparisons

How big is 393?
• 393 seconds is equal to 6 minutes, 33 seconds.
• To count from 1 to 393 would take you about three minutes.

This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 393 cubic inches would be around 0.6 feet tall.

### Recreational maths with 393

• 393 is the same when its digits are reversed! That makes it a palindromic number.
• The number of decimal digits it has is: 3
• The sum of 393's digits is 15
• More coming soon!