439

439 is the natural number that follows 438 and precedes 440. It is an odd integer and appears in various mathematical and historical contexts as a point of reference in lists, sequences, and numeral systems.

In mathematics, 439 is a prime number. Its only positive divisors are 1 and 439. Because 439 ≡ 3 (mod 4), it cannot be expressed as the sum of two squares, a consequence of the prime-sum-of-two-squares theorem. As a prime, it has no nontrivial factorization and is not divisible by any prime smaller than or equal to 19.

In Roman numerals, 439 is written as CDXXXIX.

Historically, the year AD 439 is noted for events in late antiquity. In that year the Vandals, led by King Geiseric, captured Carthage from the Western Roman Empire, establishing the Vandal Kingdom in North Africa. The conquest contributed to the disintegration of Roman authority in the western Mediterranean and reshaped regional power dynamics for several decades.

As a simple integer, 439 also appears in various contemporary contexts as a label, identifier, or catalog number across disciplines, though there is no single universal meaning attached to the number beyond its numerical and historical properties.