[[1854]] is not prime (composite). Want proof? :)

Full prime factorization: [[2]] * [[3]] * [[3]] * [[103]]

Factor pairs:

[[1854]] = [[2]] * [[927]]

[[1854]] = [[3]] * [[618]]

[[1854]] = [[6]] * [[309]]

[[1854]] = [[9]] * [[206]]

[[1854]] = [[18]] * [[103]]

Proper divisors: [[2]], [[3]], [[6]], [[9]], [[18]], [[103]], [[206]], [[309]], [[618]], [[927]]

Primes up to 1854: [[2]], [[3]], [[5]], [[7]], [[11]], [[13]], [[17]], [[19]], [[23]], [[29]], [[31]], [[37]], [[41]], [[43]], [[47]], [[53]], [[59]], [[61]], [[67]], [[71]], [[73]], [[79]], [[83]], [[89]], [[97]], [[101]], [[103]], [[107]], [[109]], [[113]], [[127]], [[131]], [[137]], [[139]], [[149]], [[151]], [[157]], [[163]], [[167]], [[173]], [[179]], [[181]], [[191]], [[193]], [[197]], [[199]], [[211]], [[223]], [[227]], [[229]], … (283 total).

[[1854]] is not a centered hexagonal number.

The closest centered hexagonal numbers are [[1801]] (index #[[25]]) and [[1951]] (index #[[26]]).

First 20 centered hexagonal numbers: [[1]], [[7]], [[19]], [[37]], [[61]], [[91]], [[127]], [[169]], [[217]], [[271]], [[331]], [[397]], [[469]], [[547]], [[631]], [[721]], [[817]], [[919]], [[1027]], [[1141]].

• [[square]]: 3437316

• [[square root]]: 43.0581

• [[cube]]: 6372783864

• [[cube root]]: 12.2849

• [[natural log]] (ln): 7.5251

• [[base-10 log]] (log10): 3.2681

• [[base-2 log]] (log2): 10.8564