Hecho general: 4023 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 4023 is the number of ways to tile a 3×23 rectangle with 3×1 rectangles.
Trivia: 4023 is a boring number.
Fecha histórica: January 5th is the day in 1993 that the oil tanker MV Braer runs aground on the coast of the Shetland Islands, spilling 84,700 tons of crude oil.