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Properties of the Number 138

One Hundred Thirty-Eight

Basics

Value: 137 → 138 → 139

Parity: even

Prime: No

Previous Prime: 137

Next Prime: 139

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 23

Divisors: 1, 2, 3, 6, 23, 46, 69, 138

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001010

Octal: 212

Duodecimal: B6

Hexadecimal: 8a

Square: 19044

Square Root: 11.74734012447073

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Abundant numbers (sum of divisors of m exceeds 2m). A5101
Average of twin prime pairs. A14574
Denominator of Bernoulli number Bn. A27642
a(n) = prime(n) - 1. A6093
a(n) = 3·n. A8585
Numbers that are the product of exactly three (not necessarily distinct) primes. A14612
Upper Wythoff sequence (a Beatty sequence): a(n) = floor(n*φ2), where φ = (1+sqrt(5))/2. A1950
Fibbinary numbers: if n = F(i1) + F(i2) + ... + F(ik) is the Zeckendorf representation of n (i.e., write n in Fibonacci number system) then a(n) = 2i1 - 2 + 2i2 - 2 + ... + 2ik - 2. Also numbers whose binary representation contains no two adjacent 1's. A3714
Positive integers congruent to 2 (mod 4): a(n) = 4·n+2, for n >= 0. A16825
Sphenic numbers: products of 3 distinct primes. A7304

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