Properties of the Number 99868

Ninety-Nine Thousand Eight Hundred Sixty-Eight

Basics

Value: 99867 → 99868 → 99869

Parity: even

Prime: No

Previous Prime: 99859

Next Prime: 99871

Digit Sum: 40

Digital Root: 4

Palindrome: No

Factorization: 2 ² × 24967

Divisors: 1, 2, 4, 24967, 49934, 99868

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11000011000011100

Octal: 303034

Duodecimal: 49964

Hexadecimal: 1861c

Square: 9973617424

Square Root: 316.0189867713647

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

Triangle T(n,k), read by rows, given by (1,2,2,3,3,4,4,5,5,6,6,...) δ (1,0,1,0,1,0,1,0,1,0,1,0,1,...) where δ is the operator defined in A084938. A200659

Number of black and white n-bead necklaces with at least 3 white beads (turning over is not allowed); also number of clockwise arrangements of reflex and non-reflex angles that can form an n-gon. A262232

In base 10, for all numbers with n digits, a(n) is the number where the sum of digits of a(n) minus the sum of the last n digits of a(n)³ reaches a record maximum. A358982

Number of ordered pairs (k, m) with k > 0 and m > 0 such that n = π(k*(k+1)/2) + π(m*(3·m-1)/2), where π(x) denotes the number of primes not exceeding x. A263020

a(n) = 5·a(n-1) - a(n-2), a(0) = 3, a(1) = 25. A99868