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Mathematics. Twenty-seven is the cube of 3, or three tetrated , divisible by the number of prime numbers below it ( nine ). The first non-trivial decagonal number is 27. [1] 27 has an aliquot sum of 13 [2] (the sixth prime number) in the aliquot sequence of only one composite number, rooted in the 13 -aliquot tree. [3]
- twenty-seven
- 3³
- 1, 3, 9, 27
- 27th
Look up million in Wiktionary, the free dictionary. 1,000,000 ( one million ), or one thousand thousand, is the natural number following 999,999 and preceding 1,000,001. The word is derived from the early Italian millione ( milione in modern Italian), from mille, "thousand", plus the augmentative suffix -one.
- one million
- F4240₁₆
- 2⁶ × 5⁶
- 1000000th, (one millionth)
Look up two thousand in Wiktionary, the free dictionary. 2000 ( two thousand) is a natural number following 1999 and preceding 2001 . It is: the highest number expressible using only two unmodified characters in Roman numerals (MM) an Achilles number [1] smallest four digit eban number [2]
- two thousand
- ,Β´
- 2⁴ × 5³
- 2000th, (two thousandth)
800 (number) 800 ( eight hundred) is the natural number following 799 and preceding 801 . It is the sum of four consecutive primes (193 + 197 + 199 + 211). It is a Harshad number, an Achilles number and the area of a square with diagonal 40. [1]
TIL: there are long scale and short scale naming systems for large numbers . Long scale refers to a system of large-number names in which every new term greater than million is 1,000,000 times the previous term: billion means a million millions (10 12), trillion means a million billions (10 18), and so on.
The number 300 is a triangular number and the sum of a pair of twin primes (149 + 151), as well as the sum of ten consecutive primes (13 + 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47). It is palindromic in 3 consecutive bases: 300 10 = 606 7 = 454 8 = 363 9, and also in base 13. Factorization is 22 × 3 × 52. 300 64 + 1 is prime.
The reason is that logically speaking, 1,000,000,000 (American billion) can be expressed in English as 1 thousand million, without the need for new words. It also doesn't sound that tedious. But when you get to 1,000,000,000,000 you start repeating yourself ie a 1 million million, so it's time for a new word (British billion).
