CCCXLVII

CCCXLVII is the Roman numeral for the number 347. It is constructed from CCC (300) + XL (40) + VII (7), using the subtractive combination XL to represent 40.

In mathematics, 347 is a prime number, meaning it has no positive divisors other than 1 and itself. It is odd and not divisible by 2, 3, 5, 7, or other small primes less than its square root, which is just over 18.

As a year, CCCXLVII can denote the year 347 in either the Common Era (347 CE) or Before Common Era (347 BCE), depending on the calendar system in use. In historical writing and chronologies, Roman numerals are frequently employed to designate years, monarchs, or events with numeric labels.

In broader usage, CCCXLVII may appear in contexts that employ Roman numerals for numbering or designation, such as sequence titles, chapter headings, or catalog entries. It remains one of many standard Roman numeral representations used to express values prior to and beyond the standard decimal system.