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400 are my pictures on TE.

400 is the square of 20.

A circle is divided into 400 grads, which is equal to 360 degrees and 2π radians. (Degrees and radians are the SI accepted units).

400 is a self number in base 10, since there is no integer that added to the sum of its own digits results in 400. On the other hand, 400 is divisible by the sum of its own base 10 digits, making it a Harshad number.

The Four Hundred (oligarchy) of ancient Athens.

400 is an HTTP status code for a bad request.

400 is a phrase meaning the wealthiest, most famous, or most powerful social group (see, e.g., Ward McAllister), leading to the generation of such lists as the Forbes 400

The Atari 400 home computer.

400 in the title of the film Les Quatre Cent Coups (The 400 Blows), a French film directed by François Truffaut.

The designation for a class of Ontario highways called 400-Series Highways.

401 prime number, tetranacci number, sum of seven consecutive primes (43 + 47 + 53 + 59 + 61 + 67 + 71), sum of nine consecutive primes (29 + 31 + 37 + 41 + 43 + 47 + 53 + 59 + 61), Chen prime, Eisenstein prime with no imaginary part, Mertens function returns 0. Also, area code for Rhode Island, also HTTP status code for an unauthorized request, also in the name of a retirement plan, 401(k)

In the year 400 first invasion of Italy by Alaric

In the year 400 the Vandals start their westward trek from Dacia and Hungary.

In the year 400 the Franks establish themselves in Northern Holland.
While taking refuge along the Danube, Gainas and his Goths are attacked by the Huns, killing him and his army.

In the year 400 Constantinople by the Hun chieftan Uldin.

In the year 400 construction at Great Zimbabwe begins.

In the year 400 the mausoleum of Galerius in Salonica is converted into a church.

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Additional Photos by Paolo Motta (Paolo) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3739 W: 144 N: 8840] (41258)
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