1991421920

Names of 1991421920

• Cardinal: 1991421920 can be written as One billion, nine hundred ninety-one million, four hundred twenty-one thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 1.99142192 × 10⁹

Factors of 1991421920

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 2252

Divisors of 1991421920

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 4 5 8 10 16 19 20 32 38 40 76 80 95 152 160 190 304 349 380 608 698 760 1396 1520 1745 1877 2792 3040 3490 3754 5584 6631 6980 7508 9385 11168 13262 13960 15016 18770 26524 27920 30032 33155 35663 37540 53048 55840 60064 66310 71326 75080 106096 132620 142652 150160 178315 212192 265240 285304 300320 356630 530480 570608 655073 713260 1060960 1141216 1310146 1426520 2620292 2853040 3275365 5240584 5706080 6550730 10481168 12446387 13101460 20962336 24892774 26202920 49785548 52405840 62231935 99571096 104811680 124463870 199142192 248927740 398284384 497855480 995710960 1991421920
• Sum of all divisors σ(n): 4969188000
• Sum of proper divisors (its aliquot sum) s(n): 2977766080
• 1991421920 is an abundant number, because the sum of its proper divisors (2977766080) is greater than itself. Its abundance is 986344160

Bases of 1991421920

• Binary: 1110110101100101010111111100000₂
• Hexadecimal: 0x76B2AFE0
• Base-36: WXN2ZK

Squares and roots of 1991421920

• 1991421920 squared (1991421920²) is 3965761263456486400
• 1991421920 cubed (1991421920³) is 7897503909534141983141888000
• The square root of 1991421920 is 44625.3506428803
• The cube root of 1991421920 is 1258.1171845549

Scales and comparisons

• 1,991,421,920 seconds is equal to 63 years, 16 weeks, 4 days, 20 hours, 45 minutes, 20 seconds.
• To count from 1 to 1,991,421,920 would take you about one hundred twenty-six years!

  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 1991421920 cubic inches would be around 104.8 feet tall.

Recreational maths with 1991421920

• 1991421920 backwards is 0291241991
• 1991421920 is a Harshad number.
• The number of decimal digits it has is: 10
• The sum of 1991421920's digits is 38
• More coming soon!