389 is the first in the smallest set of four consecutive primes (389, 397, 401, 409) that are congruent to 1 (mod 4). In other words, dividing each of these primes by 4 leaves a remainder of 1.
389 has a representation as a sum of two squares: 389 = 102 + 172.
389 is the hypotenuse of a primitive Pythagorean triple: 3892 = 1892 + 3402.
St. Patrick was born in Roman Britain in the year 389 A.D.
Source: Prime Curios!
St. Patrick was born in Roman Britain in the year 389 A.D.
Source: Prime Curios!
