138 (number)

138 (one hundred [and] thirty-eight) is the natural number following 137 and preceding 139.

← 137 138 139 →
← 130 131 132 133 134 135 136 137 138 139 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred thirty-eight
Ordinal	138th (one hundred thirty-eighth)
Factorization	2 × 3 × 23
Divisors	1, 2, 3, 6, 23, 46, 69, 138
Greek numeral	ΡΛΗ´
Roman numeral	CXXXVIII, cxxxviii
Binary	100010102
Ternary	120103
Senary	3506
Octal	2128
Duodecimal	B612
Hexadecimal	8A16

Mathematics

138 is a sphenic number,^[1] an Ulam number,^[2] an abundant number,^[3] and a square-free congruent number.^[4]

Four concentric magic circles, with a magic constant of 138.