# 1215

## 1,215 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1215 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 12 divisors.

1215 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of twelve divisors.

## Prime factorization of 1215:

### 35 × 5

(3 × 3 × 3 × 3 × 3 × 5)

See below for interesting mathematical facts about the number 1215 from the Numbermatics database.

### Names of 1215

• Cardinal: 1215 can be written as One thousand, two hundred fifteen.

### Scientific notation

• Scientific notation: 1.215 × 103

### Factors of 1215

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 8

### Divisors of 1215

• Number of divisors d(n): 12
• Complete list of divisors:
• Sum of all divisors σ(n): 2184
• Sum of proper divisors (its aliquot sum) s(n): 969
• 1215 is a deficient number, because the sum of its proper divisors (969) is less than itself. Its deficiency is 246

### Bases of 1215

• Binary: 100101111112
• Base-36: XR

### Squares and roots of 1215

• 1215 squared (12152) is 1476225
• 1215 cubed (12153) is 1793613375
• The square root of 1215 is 34.8568501159
• The cube root of 1215 is 10.6706799135

### Scales and comparisons

How big is 1215?
• 1,215 seconds is equal to 20 minutes, 15 seconds.
• To count from 1 to 1,215 would take you about twenty 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 1215 cubic inches would be around 0.9 feet tall.

### Recreational maths with 1215

• 1215 backwards is 5121
• 1215 is a Harshad number.
• The number of decimal digits it has is: 4
• The sum of 1215's digits is 9
• More coming soon!