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40 (forty) is the natural number following 39 and preceding 41. Though the word is related to four (4), the spelling forty replaced fourty during the 17th century [ 1 ] [ 2 ] and is now the standard form.
Roman numerals are a numeral system that originated in ancient Rome and remained the usual way of writing ... and is in any case not an unambiguous Roman numeral. [40
42 is a pronic number, [1] an abundant number [2] as well as a highly abundant number, [3] a practical number, [4] an admirable number, [5] and a Catalan number. [6]The 42-sided tetracontadigon is the largest such regular polygon that can only tile a vertex alongside other regular polygons, without tiling the plane.
A form of unary notation called Church encoding is used to represent numbers within lambda calculus. Some email spam filters tag messages with a number of asterisks in an e-mail header such as X-Spam-Bar or X-SPAM-LEVEL. The larger the number, the more likely the email is considered spam. 10: Bijective base-10: To avoid zero: 26: Bijective base-26
The Latin numerals are the words used to denote numbers within the Latin language. ... 40: XL: quadrāgintā: 400: CD ... Thus Roman authors would write: ...
140 is an odious number because it has an odd number of ones in its binary representation. The sum of Euler's totient function φ( x ) over the first twenty-one integers is 140. 140 is a repdigit in bases 13, 19, 27, 34, 69, and 139.
the largest lucky number of Euler: the polynomial f(k) = k 2 − k + 41 yields primes for all the integers k with 1 ≤ k < 41. the sum of two squares (4 2 + 5 2), which makes it a centered square number. [4] the sum of the first three Mersenne primes, 3, 7, 31. [5] the sum of the sum of the divisors of the first 7 positive integers.
43 is a Heegner number. [4] 43 is the largest prime which divides the order of the Janko group J 4. 43 is a repdigit in base 6 (111). 43 is the largest natural number that is not an (original) McNugget number. [5] 43 is the smallest prime number expressible as the sum of 2, 3, 4, or 5 different primes: 43 = 41 + 2; 43 = 11 + 13 + 19; 43 = 2 ...