Properties of the Number 18855

Eighteen Thousand Eight Hundred Fifty-Five

Basics

Value: 18854 → 18855 → 18856

Parity: odd

Prime: No

Previous Prime: 18839

Next Prime: 18859

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 × 419

Divisors: 1, 3, 5, 9, 15, 45, 419, 1257, 2095, 3771

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100110100111

Octal: 44647

Duodecimal: AAB3

Hexadecimal: 49a7

Square: 355511025

Square Root: 137.3135098961497

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

T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero. A304347

Number of ways to write n as an ordered sum of 5 prime powers (including 1). A341134

Expansion of 1/(1 - 10·x + 9·x²)^3/2. A331516

Numbers of the form 86+p² (where p is a prime). A138692

Number of partitions of n such that the number of parts having multiplicity 1 is not a part and the number of distinct parts is not a part. A241445

Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of 1/(1 - 2·k*x + ((k-2)*x)²)^3/2. A331514

T(n, 2·n-5), T given by A027960. A27967

Number of labeled connected 3-chromatic (i.e., chromatic number = 3) graphs on n nodes. A84273

Numbers n such that xⁿ + x¹¹ + 1 is irreducible over GF(2). A57481

σ(n)-n values in A085844. A216383