172 (stó dváinsédemdeset) je naravno število, za katero velja 172 = 171 + 1 = 173 - 1.
Več informacij 
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| |||
| Glavni števnik | sto dvainsedemdeset | ||
| Vrstilni števnik | stodvainsedemdeseti | ||
| Razcep | |||
| Rimska številka | CLXXII | ||
| Dvojiško | 10101100 | ||
| Šestnajstiško | AC | ||
| Matematične lastnosti | |||
|---|---|---|---|
| φ(172) = 84 | |||
| τ(172) = 6 {1, 2, 4, 43, 86, 172} | |||
| σ(172) = 308 | |||
| π(172) = 39 | |||
| μ(172) = 0 | |||
| M(172) = -2 | |||
Ne obstaja noben takšen cel x, da bi veljala enačba x - φ(x) = 172.
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