Properties of the Number 18380

Eighteen Thousand Three Hundred Eighty

Basics

Value: 18379 → 18380 → 18381

Parity: even

Prime: No

Previous Prime: 18379

Next Prime: 18397

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5 × 919

Divisors: 1, 2, 4, 5, 10, 20, 919, 1838, 3676, 4595

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100011111001100

Octal: 43714

Duodecimal: A778

Hexadecimal: 47cc

Square: 337824400

Square Root: 135.5728586406586

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 (n+2)X(k+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011. A260284

Sum of diagonal numbers in a Pascal-like triangle with index of asymmetry y = 3 and index of obliquity z = 0 (going upwards, left to right). A141072

Number of (strict) compositions of n whose differences of all degrees are nonzero. A325851

Number of quasi-pentominoes in an n X n bounding box. A94172

Number T(n,k) of tilings of a 5 X n rectangle with pentominoes of any shape and exactly k pentominoes of shape L; triangle T(n,k), n>=0, 0<=k<=n, read by rows. A247704

Sum of the squares of the larger parts of the partitions of 2n into two squarefree parts. A280322

a(n) = T(n,0) + T(n,1) + ... + T(n,n), T given by A027170. A27178

Start with n, apply k->2k+1 until reach new record prime; sequence gives number of steps needed. A51918

Number of terms in n-th order nested Lie bracket. A255502

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011. A260280