Forty-seven is a number that is composed of 4 and 7. It can be written as "47" in Arabic numerals or "XLVII" in Roman numerals. In mathematics, forty-seven is an odd composite number, meaning it has factors other than 1 and itself. It is the 15th prime number and it has two distinct prime factors, which are 2 and 23. Forty-seven can also be expressed as the sum of three consecutive integers, namely 16 + 17 + 18 = 47. In addition, 47 is an abundant number since its proper divisors add up to more than 47 itself (1 + 2 + 4 + 8 + 16 + 23 = 54).