540 = 22 × 33 × 5. It is:
- an untouchable number.[24]
- a heptagonal number.
- a decagonal number.[43]
- a repdigit in bases 26 (KK26), 29 (II29), 35 (FF35), 44 (CC44), 53 (AA53), and 59 (9959).
- a Harshad number.
- the number of doors to Valhalla according to the Prose Edda.[44]
- the number of floors in Thor's hall, known as Bilskirnir, according to the Prose Edda.[45]
- the sum of a twin prime (269 + 271)
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