Število 400: Naravno število
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| |||
| Glavni števnik | štiristo | ||
| Vrstilni števnik | štiristoti | ||
| Razcep | |||
| Rimska številka | CD | ||
| Dvojiško | 110010000 | ||
| Šestnajstiško | 190 | ||
| Matematične lastnosti | |||
|---|---|---|---|
| φ(400) = 160 | |||
| τ(400) = 15 {1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400} | |||
| σ(400) = 961 | |||
| π(400) = 78 | |||
| μ(400) = 0 | |||
| M(400) = 1 | |||
400 (štíri stó) je naravno število, za katerega velja 400 = 399 + 1 = 401 - 1.
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