900

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Number

$900$ (nine hundred) is:

$2^2 \times 3^2 \times 5^2$

The $11$th square number after $1$, $4$, $36$, $121$, $144$, $256$, $324$, $400$, $576$, $784$ to be the divisor sum value of some (strictly) positive integer:

$900 = \map {\sigma_1} {472}$

The $30$th square number after $1$, $4$, $9$, $16$, $25$, $36$, $\ldots$, $625$, $676$, $729$, $784$, $841$:

$900 = 30 \times 30$

Also see

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