Properties of the Number 18815

Eighteen Thousand Eight Hundred Fifteen

Basics

Value: 18814 → 18815 → 18816

Parity: odd

Prime: No

Previous Prime: 18803

Next Prime: 18839

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 5 × 53 × 71

Divisors: 1, 5, 53, 71, 265, 355, 3763, 18815

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100101111111

Octal: 44577

Duodecimal: AA7B

Hexadecimal: 497f

Square: 354004225

Square Root: 137.16778047340418

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

Divide natural numbers in groups with prime(n) elements and add together. A34956

Record high points in A386487. A386488

a(n) = 24·n² - 1. A158544

Number of (w,x,y,z) with all terms in {0,...,n} and max{w,x,y,z}>=2·min{w,x,y,z}. A212741

Continued fraction expansion with iterated 3-fold symmetry. A89267

a(n) = 784·n - 1. A158399

a(1) = 1, and for each k >=2, a(k) is the smallest number n such that n/sin(n) > a(k)/sin(a(k)), so that a(1)/sin(a(1)) > a(2)/sin(a(2)) > ... > a(k)/sin(a(k)) > ... A172445

Number of partitions p of n such that (# 1s in p) = (#1s in conjugate(p)). A240691

The smallest positive number that when written in all bases 2 to n contains two or more adjacent equal digits. A375958

Poincaré series for invariant polynomial functions on the space of binary forms of degree 16. A293941