38 (number)

← 37 38 39 →
← 30 31 32 33 34 35 36 37 38 39 → List of numbers — Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	thirty-eight
Ordinal	38th (thirty-eighth)
Factorization	2 × 19
Divisors	1, 2, 19, 38
Roman numeral	XXXVIII
Binary	1001102
Ternary	11023
Quaternary	2124
Quinary	1235
Senary	1026
Octal	468
Duodecimal	3212
Hexadecimal	2616
Vigesimal	1I20
Base 36	1236

38 (thirty-eight) is the natural number following 37 and preceding 39.

38 is the 11th distinct semiprime and the 7th in the {2 · q} family. It is the initial member of the third distinct semiprime pair (38, 39).

38 has an aliquot sum of 22 which is itself a distinct semiprime In fact 38 is the first number to be at the head of a chain of four distinct semiprimes in its 8-member aliquot sequence (38, 22, 14, 10, 8, 7, 1, 0). 38 is the 8th member of the 7-aliquot tree.

38! − 1 yields 7044523022617466601♠523022617466601111760007224100074291199999999, which is the 16th factorial prime.

There is no answer to the equation φ(x) = 38, making 38 a nontotient.

38 is the sum of the squares of the first three primes.

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