Properties of the Number 18905

Eighteen Thousand Nine Hundred Five

Basics

Value: 18904 → 18905 → 18906

Parity: odd

Prime: No

Previous Prime: 18899

Next Prime: 18911

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 5 × 19 × 199

Divisors: 1, 5, 19, 95, 199, 995, 3781, 18905

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100111011001

Octal: 44731

Duodecimal: AB35

Hexadecimal: 49d9

Square: 357399025

Square Root: 137.4954544703206

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

Number of integer compositions of n that are the first sums of a unique composition. A391644

Index where prime(n) appears as a term in A379248. A379290

Number of Aut(G)-orbits on G-characters that come from Riemann surfaces of genus n. A347373

Sums of 5 distinct powers of 5. A38477

(prime(n)*(prime(n+1)-1) + (prime(n)-1)*prime(n+1)) / 2. A99909

Positive numbers k such that -k, -(k + 1), and -(k + 2) are 3 consecutive negative negaFibonacci-Niven numbers (A331088). A331090

Number of {-1,0,1} n X n matrices that have (real and) positive eigenvalues. A85506

a(n) = A160799(n)/4. A160807

The smallest number which when multiplied by the n-th repunit gives a Smith number. A176385

Number of conjugacy classes for a non-abelian group of order p³, where p is prime: a(n) = p² + p - 1 where p = prime(n). A319597