"400" is correct and usable in written English.
It is a numerical value representing the quantity or amount of something. You can use "400" in written English when referring to a specific number or quantity, such as a measurement, a score, or a quantity of items. Example: "The recipe calls for 400 grams of flour." This sentence uses "400" to indicate the amount of flour needed in the recipe.
The equal marriage bill was given an overwhelming second reading by 400 votes to 175, a majority of 225.
Sheela Patel says, "We talk about water conservation in the summer, not before the rains, we talk about mosquitoes when 400 people died of dengue.
There are currently 400 children's centres in London but they are under pressure from central government spending cuts.
The town of only about 400 residents draws tens of thousands of visitors every year to one of the widest and most scenic spots on the Mighty Mississippi.
A Minnesota national guardsman faces federal fraud charges in connection with the theft of names, social security numbers and security clearance levels of roughly 400 members of his former army unit in Fort Bragg, North Carolina.
Detectives are presently following 400 lines of inquiry, while the BBC has launched an inquiry into the culture and practices at the corporation in the era of Savile's alleged sexual abuse.
"A £10,000 investment in Ecclesiastical Higher Income in 1994 would have paid £400 in the first year.
10 10 has now worked with 50 schools in a diverse range of communities from the Isles of Scilly to Stockton-on-Tees, who have collectively raised over £400,000 for Solar.
A week at Surf Berbere, including accommodation, surfing and tuition, but not flights, starts at £400.
It was followed by a moment of solidarity with the 400-strong audience taping their mouths as a form of silent protest.
Make your own rhubarb cordial – put 400-450g rhubarb, 250g sugar, the juice of half a lemon and 500ml water in a pan, bring to a boil, simmer until the rhubarb has disintegrated, then cool, strain through muslin into a jug (it will take a few hours to drip through) and refrigerate; or buy a decent commercial brand.
