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Wiktionary
four hundred

num. (context cardinal English) The cardinal number occurring after three hundred ninety-nine and before four hundred one, represented in Arabic numerals as 400.

WordNet
four hundred
  1. adj. being one hundred more than three hundred [syn: 400, cd]

  2. n. the exclusive social set of a city

Usage examples of "four hundred".

Multiply by three hundred and sixteen, and the result is the number you first thought of minus four hundred and five.

I figured the house was probably around five thousand square feet and cost maybe four hundred thousand.

It's a helluva squeeze and a big load, what with knapsacks and fire-brooms and a big pile of pre-soaked hessian bags and the tanks carrying four hundred gallons of water.