Compare 7 vs 42

Typeprimecomposite number
Unique factors13
Total factors13
Prime factorization7121 × 31 × 71
Prime factorization72 × 3 × 7
Divisors count28
Divisors1, 71, 2, 3, 6, 7, 14, 21, 42
Number of properties370
Additive primes4th 
Carol primes1st 
Chen primes4th 
Class 1+ primes4th 
Cousin primes (1st member)2nd 
Cousin primes (2nd member)1st 
Cuban primes 11st 
Double mersenne primes1st 
Euclid primes3rd 
Factorial primes4th 
Happy primes1st 
Kynea primes2nd 
Left-truncatable primes4th 
Long primes1st 
Lucas primes3rd 
Lucky primes2nd 
Mersenne primes2nd 
Multiplicative primes4th 
Palindromic primes4th 
Pierpont primes4th 
Pierpont primes of the 2nd kind4th 
Prime quadruplets (2nd member)1st 
Prime quintuplet 1s (1st member)1st 
Prime quintuplet 2s (2nd member)1st 
Prime sextuplets (1st member)1st 
Prime triplets (1st member)2nd 
Prime triplets (2nd member)1st 
Right-truncatable primes4th 
Safe primes2nd 
Sexy primes (1st member)2nd 
Sexy prime triplets (1st member)2nd 
Solinas primes3rd 
Thabit primes of the 2nd kind1st 
Twin primes (2nd member)2nd 
Two-sided primes4th 
Woodall primes1st 
Roman numberalsVIIXLII
Base 211121010102
Base 321311203
Base 41342224
Base 51251325
Base 61161106
Base 7107607
Base 878528
Base 979469
Base 107104210
Base 117113911
Base 127123612
Base 137133313
Base 147143014
Base 157152c15
Base 167162a16
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