Properties of the Number 18138

Eighteen Thousand One Hundred Thirty-Eight

Basics

Value: 18137 → 18138 → 18139

Parity: even

Prime: No

Previous Prime: 18133

Next Prime: 18143

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 3023

Divisors: 1, 2, 3, 6, 3023, 6046, 9069, 18138

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100011011011010

Octal: 43332

Duodecimal: A5B6

Hexadecimal: 46da

Square: 328987044

Square Root: 134.6773923121472

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

Number of partitions of n into parts not greater than sqrt(n). A97356

Numbers k that, when expressed in base 6 and then interpreted in base 8, give a multiple of k. A62937

Number of partitions of n into at most 7 parts. A8636

Numbers that can be represented as p^r + q^s with 4 distinct odd primes p, q, r, s. A390179

0-sequence of reduction of tetrahedral number sequence by x² -> x+1. A192246

a(n) = ∑_k=1..n F(n mod k) where F = A000045, the Fibonacci numbers. A198259

a(n) is the numerator of the generalized continued fraction with terms σ(m)/m for m=1 to n. A254059

Number of partitions of positive integer n such that all parts are less than the square root of n. A316353

Least positive integer k such that ∑_i=1..k φ(i) >= 10ⁿ. A343802

Number of partitions satisfying cn(2,5) + cn(3,5) < cn(1,5) + cn(4,5). A39893