Properties of the Number 18000

Eighteen Thousand

Basics

Value: 17999 → 18000 → 18001

Parity: even

Prime: No

Previous Prime: 17989

Next Prime: 18013

Digit Sum: 9

Digital Root: 9

Palindrome: No

Factorization: 2 ⁴ × 3 ² × 5 ³

Divisors: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100011001010000

Octal: 43120

Duodecimal: A500

Hexadecimal: 4650

Square: 324000000

Square Root: 134.16407864998737

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: Yes

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

Regular triangle where T(n,k) is the number of clutters (connected antichains) on n + 1 vertices with k maximal blobs (2-connected components). A317672

Powerful numbers divisible by cubes of 2 distinct primes. A376936

Numbers n that raised to the powers from 1 to k (with k>=1) are multiple of the sum of their digits (n raised to k+1 must not be a multiple). Case k=8. A135193

a(n) = A000010(A276086(n)). A324650

Numbers k such that the k-th composition in standard order is an alternating permutation of {1..k} for some k. A349051

a(n) = 20·n². A195322

a(n) = ((1+4·sqrt(2))*(2+sqrt(2))ⁿ + (1-4·sqrt(2))*(2-sqrt(2))ⁿ)/2. A164298

Numbers k such that the average digit of k² is 1. A164771

a(n) = 14·n² - 4·n. A195023

Sum of the partition parts of 3n into 3 parts. A235988