Which letter doesn’t appear in any number before 1,000?

Michael Nordine – Every single- and double-digit number has something in common that has nothing to do with their mathematical values: When spelled out, none contains the letter “A.” The first number spelled with the first letter of the alphabet is 1,000. Every other vowel appears at least once before “A” makes its long-awaited debut.

The letter “B,” meanwhile, doesn’t show up until 1 billion, and “C” isn’t used until much later, in 1 octillion (a little-used number featuring a whopping 27 zeros). Funnily enough, less commonly used letters such as “Z” and “X” show up extremely early — in zero and six, respectively — with “X” showing up more than 200 times before “A” shows up once.

Other rarer letters are also seldom used: “J” doesn’t appear in any number, and “Q” doesn’t show up until 1 quadrillion (1 followed by 15 zeros). “E” is the most common letter, showing up in approximately 11% of spelled-out numbers.

SF Source Interesting Facts Feb 2026