Properties of the Number 18019

Eighteen Thousand Nineteen

Basics

Value: 18018 → 18019 → 18020

Parity: odd

Prime: No

Previous Prime: 18013

Next Prime: 18041

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 37 × 487

Divisors: 1, 37, 487, 18019

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011001100011

Octal: 43143

Duodecimal: A517

Hexadecimal: 4663

Square: 324684361

Square Root: 134.23486879346962

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

Compound filter (prime signature & sum of the divisors): a(n) = P(A046523(n), A000203(n)), where P(n,k) is sequence A000027 used as a pairing function. A286360

a(n) = (n³)/2 + (3·n²)/2 + 3·n + 3. A127873

29-gonal numbers: a(n) = n*(27·n-25)/2. A255187

Semiprimes in A003215. A113530

a(n) = 12·n² + 18·n + 7. A154105

Compound filter: a(n) = P(A046523(n), A161942(n)), where P(n,k) is sequence A000027 used as a pairing function. A286034

The least number s having exactly n threes in the continued fraction of sqrt(s). A206583

a(n) = greatest k such that A155043(k+A262509(n)) < A155043(A262509(n)). A262909

Number of symmetric polyominoes in {4,5} tessellation of the hyperbolic plane. A390192

Odd semiprimes k = p·q such that k = A325820(p,q), with p, q primes > 3, and A325820 is the carryless base-3 multiplication. A391331