The number "423" is a three-digit integer that follows 422 and precedes 424. It is an odd number and can be expressed as the sum of 400 and 23. In mathematics, it can be factored into prime numbers as 3 × 141 or 423 = 3 × 3 × 47. In the context of area codes, 423 is a telephone area code in the United States, covering parts of Tennessee. It was established in 1997 and serves cities like Chattanooga and Johnson City. Area codes are essential for routing phone calls within specific regions.