19891

Names of 19891

• Cardinal: 19891 can be written as Nineteen thousand, eight hundred ninety-one.

Scientific notation

• Scientific notation: 1.9891 × 10⁴

Factors of 19891

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 19891

Divisors of 19891

• Number of divisors d(n): 2
• Complete list of divisors:
  1 19891
• Sum of all divisors σ(n): 19892
• Sum of proper divisors (its aliquot sum) s(n): 1
• 19891 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 19890

Bases of 19891

• Binary: 100110110110011₂
• Hexadecimal: 0x4DB3
• Base-36: FCJ

Squares and roots of 19891

• 19891 squared (19891²) is 395651881
• 19891 cubed (19891³) is 7869911564971
• The square root of 19891 is 141.0354565349
• The cube root of 19891 is 27.0947743903

Scales and comparisons

• 19,891 seconds is equal to 5 hours, 31 minutes, 31 seconds.
• To count from 1 to 19,891 would take you about five 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 19891 cubic inches would be around 2.3 feet tall.

Recreational maths with 19891

• 19891 is the same when its digits are reversed! That makes it a palindromic prime number.
• The number of decimal digits it has is: 5
• The sum of 19891's digits is 28
• More coming soon!