18381440

Names of 18381440

• Cardinal: 18381440 can be written as Eighteen million, three hundred eighty-one thousand, four hundred forty.

Scientific notation

• Scientific notation: 1.838144 × 10⁷

Factors of 18381440

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 398

Divisors of 18381440

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 4 5 7 8 10 11 14 16 20 22 28 32 35 40 44 55 56 64 70 77 80 88 110 112 128 140 154 160 176 220 224 280 308 320 352 373 385 440 448 560 616 640 704 746 770 880 896 1120 1232 1408 1492 1540 1760 1865 2240 2464 2611 2984 3080 3520 3730 4103 4480 4928 5222 5968 6160 7040 7460 8206 9856 10444 11936 12320 13055 14920 16412 20515 20888 23872 24640 26110 28721 29840 32824 41030 41776 47744 49280 52220 57442 59680 65648 82060 83552 104440 114884 119360 131296 143605 164120 167104 208880 229768 238720 262592 287210 328240 334208 417760 459536 525184 574420 656480 835520 919072 1148840 1312960 1671040 1838144 2297680 2625920 3676288 4595360 9190720 18381440
• Sum of all divisors σ(n): 54933120
• Sum of proper divisors (its aliquot sum) s(n): 36551680
• 18381440 is an abundant number, because the sum of its proper divisors (36551680) is greater than itself. Its abundance is 18170240

Bases of 18381440

• Binary: 1000110000111101010000000₂
• Hexadecimal: 0x1187A80
• Base-36: AXZ7K

Squares and roots of 18381440

• 18381440 squared (18381440²) is 337877336473600
• 18381440 cubed (18381440³) is 6210671987749289984000
• The square root of 18381440 is 4287.3581609191
• The cube root of 18381440 is 263.9124288675

Scales and comparisons

• 18,381,440 seconds is equal to 30 weeks, 2 days, 17 hours, 57 minutes, 20 seconds.
• To count from 1 to 18,381,440 would take you about forty-five weeks!

  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 18381440 cubic inches would be around 22 feet tall.

Recreational maths with 18381440

• 18381440 backwards is 04418381
• The number of decimal digits it has is: 8
• The sum of 18381440's digits is 29
• More coming soon!