1,205 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1205 look like?

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

1205 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 1205:

5 × 241

See below for interesting mathematical facts about the number 1205 from the Numbermatics database.

Names of 1205

  • Cardinal: 1205 can be written as One thousand, two hundred five.

Scientific notation

  • Scientific notation: 1.205 × 103

Factors of 1205

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 246

Divisors of 1205

  • Number of divisors d(n): 4
  • Complete list of divisors:
  • Sum of all divisors σ(n): 1452
  • Sum of proper divisors (its aliquot sum) s(n): 247
  • 1205 is a deficient number, because the sum of its proper divisors (247) is less than itself. Its deficiency is 958

Bases of 1205

  • Binary: 100101101012
  • Hexadecimal: 0x4B5
  • Base-36: XH

Squares and roots of 1205

  • 1205 squared (12052) is 1452025
  • 1205 cubed (12053) is 1749690125
  • The square root of 1205 is 34.7131099155
  • The cube root of 1205 is 10.6413243871

Scales and comparisons

How big is 1205?
  • 1,205 seconds is equal to 20 minutes, 5 seconds.
  • To count from 1 to 1,205 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 1205 cubic inches would be around 0.9 feet tall.

Recreational maths with 1205

  • 1205 backwards is 5021
  • The number of decimal digits it has is: 4
  • The sum of 1205's digits is 8
  • More coming soon!

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The information we have on file for 1205 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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