12345

Names of 12345

• Cardinal: 12345 can be written as Twelve thousand, three hundred forty-five.

Scientific notation

• Scientific notation: 1.2345 × 10⁴

Factors of 12345

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 831

Divisors of 12345

• Number of divisors d(n): 8
• Complete list of divisors:
  1 3 5 15 823 2469 4115 12345
• Sum of all divisors σ(n): 19776
• Sum of proper divisors (its aliquot sum) s(n): 7431
• 12345 is a deficient number, because the sum of its proper divisors (7431) is less than itself. Its deficiency is 4914

Bases of 12345

• Binary: 11000000111001₂
• Hexadecimal: 0x3039
• Base-36: 9IX

Squares and roots of 12345

• 12345 squared (12345²) is 152399025
• 12345 cubed (12345³) is 1881365963625
• The square root of 12345 is 111.1080555137
• The cube root of 12345 is 23.1116187497

Scales and comparisons

• 12,345 seconds is equal to 3 hours, 25 minutes, 45 seconds.
• To count from 1 to 12,345 would take you about three hours.

  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 12345 cubic inches would be around 1.9 feet tall.

Recreational maths with 12345

• 12345 backwards is 54321
• 12345 is a Harshad number.
• The number of decimal digits it has is: 5
• The sum of 12345's digits is 15
• More coming soon!