Properties of the Number 18009

Eighteen Thousand Nine

Basics

Value: 18008 → 18009 → 18010

Parity: odd

Prime: No

Previous Prime: 17989

Next Prime: 18013

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 23 × 29

Divisors: 1, 3, 9, 23, 27, 29, 69, 87, 207, 261

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100011001011001

Octal: 43131

Duodecimal: A509

Hexadecimal: 4659

Square: 324324081

Square Root: 134.19761547807025

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

Positions of zeros in A165597. A165598

Number of primes between n⁴ and (n+1)⁴. A61235

Numbers·such that the sum of all their cyclic permutations is equal to that of all cyclic permutations of σ(x) and all cyclic permutations of Euler totient function φ(x). A247317

a(1) = 1, a(n) = a(n-1) + φ(a(n-1)). A74693

Numbers k such that φ(φ(k)) = σ(rad(k)). A173748

Number of length 4+4 0..n arrays with every five consecutive terms having four times some element equal to the sum of the remaining four. A249660

Powers of cube root of 12 rounded down. A18009

T(n,k)=Number of length n+4 0..k arrays with every five consecutive terms having four times some element equal to the sum of the remaining four. A249656