Properties of the Number 18120

Eighteen Thousand One Hundred Twenty

Basics

Value: 18119 → 18120 → 18121

Parity: even

Prime: No

Previous Prime: 18119

Next Prime: 18121

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ³ × 3 × 5 × 151

Divisors: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100011011001000

Octal: 43310

Duodecimal: A5A0

Hexadecimal: 46c8

Square: 328334400

Square Root: 134.61054936371073

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

Numbers k such that k-1, k+1 and k²+1 are prime numbers. A70155

Determinants of 4 X 4 matrices of 16 consecutive primes. A118799

Numbers m such that m⁴-1 has no divisors d with 1 < d < m-1. A129293

Numbers n such that σ(n+σ(n)) = 4*σ(n). A246911

Numbers k such that k+1, 2k+1, 3k+1, 4k+1 are all prime. A237189

Number of transitive relations on an n-set with exactly four ordered pairs. A349849

p-INVERT of the positive Fibonacci numbers (A000045), where p(S) = 1 - S - S². A289781

a(n) = [ a(n-1)/a(1) + a(n-2)/a(2) + ... + a(1)/a(n-1) ], for n >= 3. A22857

Number of (w,x,y,z) with all terms in {1,...,n} and w+x>=2y+2z. A212565

E.g.f. A(x) satisfies A(x) = exp(x² * (1+x)³ * A(x)). A389786