1405

Names of 1405

• Cardinal: 1405 can be written as One thousand, four hundred five.

Scientific notation

• Scientific notation: 1.405 × 10³

Factors of 1405

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 286

Divisors of 1405

• Number of divisors d(n): 4
• Complete list of divisors:
  1 5 281 1405
• Sum of all divisors σ(n): 1692
• Sum of proper divisors (its aliquot sum) s(n): 287
• 1405 is a deficient number, because the sum of its proper divisors (287) is less than itself. Its deficiency is 1118

Bases of 1405

• Binary: 10101111101₂
• Hexadecimal: 0x57D
• Base-36: 131

Squares and roots of 1405

• 1405 squared (1405²) is 1974025
• 1405 cubed (1405³) is 2773505125
• The square root of 1405 is 37.4833296279
• The cube root of 1405 is 11.2001913233

Scales and comparisons

• 1,405 seconds is equal to 23 minutes, 25 seconds.
• To count from 1 to 1,405 would take you about twenty-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 1405 cubic inches would be around 0.9 feet tall.

Recreational maths with 1405

• 1405 backwards is 5041
• The number of decimal digits it has is: 4
• The sum of 1405's digits is 10
• More coming soon!