The number 15

Representation numerals

Greek numeral

ιεʹ

Arabic numeral

١٥

Roman numeral

XV

Maya numeral

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Chinese numeral

十五

Hebrew numeral

טו
Numeral systems
Binary: 1111
Septimal (base 7): 21
Octal: 17
Hexadecimal: f
Base 24: F
Factorization
15 = 3 × 5
15 has 4 divisors: 1, 3, 5, 15
Sum of all divisors other than 15: 9
Sums & differences
Difference of 2 squares: 15 = 82 - 72
Characteristics
15 is a triangular number
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The next triangular is: 21
15 is a hexagonal number
15 is a palindromic number in binary system (1111)
Related primes
The 15th prime number is: 47
Previous prime number: 13 — Next prime number: 17

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