Properties of the Number 18987

Eighteen Thousand Nine Hundred Eighty-Seven

Basics

Value: 18986 → 18987 → 18988

Parity: odd

Prime: No

Previous Prime: 18979

Next Prime: 19001

Digit Sum: 33

Digital Root: 6

Palindrome: No

Factorization: 3 × 6329

Divisors: 1, 3, 6329, 18987

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100101000101011

Octal: 45053

Duodecimal: ABA3

Hexadecimal: 4a2b

Square: 360506169

Square Root: 137.793323495734

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 A(k+1) = A(k) + 1, where A() = A005101() are the abundant numbers. A169822

Number of partitions p of n such that (number of even numbers in p) >= 2*(number of odd numbers in p). A241644

Triangle T(n,m) read by rows: the matrix product A130595·A156919. A185412

Smooth Lyndon words with 5 colors. A215332

Number of 0..n arrays of length 6 with each element differing from at least one neighbor by 1 or less. A221598

Number of squarefree parts in the partitions of n into 9 parts. A309463

Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=1, r=5, I={0,3}. A79965

T(n,k)=Number of 0..k arrays of length n with each element differing from at least one neighbor by 1 or less. A221596

Candidate sequence for theme song for OEIS. A124856

Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite ATS = MAPO-36 H[MgAl11P12O48] starting with a T3 atom. A18987