XXXVIII

XXXVIII is the Roman numeral for the decimal number 38. It is formed by combining XXX (30) and VIII (8). In standard Roman numeral notation the value is additive here, since the symbols are arranged in non-increasing order; no subtraction is needed in this form.

Historically, Roman numerals were used for dates, regnal numbers, and enumerated lists. In modern contexts, XXXVIII may appear in year designations such as 38 CE or 38 BCE, in the labeling of chapters or volumes, or as a regnal or ordinal identifier in lists that retain Roman numeral styling. The numeral is read as “thirty-eight” or, in ordinal form, “the thirty-eighth.”

Numerical properties of 38 include its status as an even, composite number. It factors as 2 × 19 and has divisors 1, 2, 19, and 38. In other representations, 38 equals 100110 in binary and 26 in hexadecimal. The number is often encountered in mathematics and everyday contexts as a simple two-factor composite, distinct from prime or more complexly structured numbers.

See also: Roman numerals, notation systems, list of Roman numerals.