- published: 29 May 2014
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14 (fourteen /fɔərˈtiːn/) is the natural number following 13 and preceding 15. In speech, the numbers 14 and 40 are often confused. When carefully enunciated, they differ in which syllable is stressed: 14 /fɔərˈtiːn/ ( listen) vs 40 /ˈfɔrti/. However, in dates such as 1492 or when contrasting numbers in the teens, such as 13, 14, 15, the stress shifts to the first syllable: 14 /ˈfɔərtiːn/.
Fourteen is a composite number, its divisors being 1, 2, 7 and 14.
14 is the 3rd discrete semiprime ( 2 . 7 ) and the 3rd member of the (2.q) discrete semiprime family. The number following 14—15 is itself a discrete semiprime and this is the first such pair of discrete semiprimes. The next example is the pair commencing 21.
The aliquot sum σ(n) of 14 is 10, also a discrete semiprime and this is again the first example of a discrete semiprime having an aliquot sum in the same form. 14 has an aliquot sequence of 6 members ( 14,10,8,7,1,0) 14 is the third composite number in the 7-aliquot tree.
Fourteen is itself the Aliquot sum of two numbers; the discrete semiprime 22, and the square number 196.
A number is a mathematical object used to count and measure. In mathematics, the definition of number has been extended over the years to include such numbers as zero, negative numbers, rational numbers, irrational numbers, and complex numbers.
Mathematical operations are certain procedures that take one or more numbers as input and produce a number as output. Unary operations take a single input number and produce a single output number. For example, the successor operation adds one to an integer, thus the successor of 4 is 5. Binary operations take two input numbers and produce a single output number. Examples of binary operations include addition, subtraction, multiplication, division, and exponentiation. The study of numerical operations is called arithmetic.
A notational symbol that represents a number is called a numeral. In addition to their use in counting and measuring, numerals are often used for labels (telephone numbers), for ordering (serial numbers), and for codes (e.g., ISBNs).