1990

Names of 1990

• Cardinal: 1990 can be written as One thousand, nine hundred ninety.

Scientific notation

• Scientific notation: 1.99 × 10³

Factors of 1990

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 206

Divisors of 1990

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 5 10 199 398 995 1990
• Sum of all divisors σ(n): 3600
• Sum of proper divisors (its aliquot sum) s(n): 1610
• 1990 is a deficient number, because the sum of its proper divisors (1610) is less than itself. Its deficiency is 380

Bases of 1990

• Binary: 11111000110₂
• Hexadecimal: 0x7C6
• Base-36: 1JA

Squares and roots of 1990

• 1990 squared (1990²) is 3960100
• 1990 cubed (1990³) is 7880599000
• The square root of 1990 is 44.6094160463
• The cube root of 1990 is 12.5781767195

Scales and comparisons

• 1,990 seconds is equal to 33 minutes, 10 seconds.
• To count from 1 to 1,990 would take you about thirty-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 1990 cubic inches would be around 1 feet tall.

Recreational maths with 1990

• 1990 backwards is 0991
• The number of decimal digits it has is: 4
• The sum of 1990's digits is 19
• More coming soon!