397

397 is a natural number that follows 396 and precedes 398. In mathematics, it is prime, meaning its only positive divisors are 1 and itself. It is odd and congruent to 1 modulo 4, a property that makes it expressible as a sum of two squares: 19^2 + 6^2 = 361 + 36 = 397.

In numeral systems, 397 is 0x18D in hexadecimal and 110001101 in binary. In Roman numerals it is CCCXCVII.

In calendar history, the year 397 CE falls in the late Roman Empire period. Notably, the Council of Carthage convened in 397 and issued canonical lists for Christian Scripture used in the region, contributing to the development of the Western church’s biblical canon.

In astronomy, 397 Philomela is a main-belt asteroid, discovered in 1894 and named after a figure from Greek mythology.

As a numeral, 397 appears in various contexts such as identifiers, catalog numbers, and route or model designations. Aside from its mathematical characteristics and specific historical and astronomical references, it does not have a single universal meaning.