Properties of the Number 26818

Twenty-Six Thousand Eight Hundred Eighteen

Basics

Value: 26817 → 26818 → 26819

Parity: even

Prime: No

Previous Prime: 26813

Next Prime: 26821

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 × 11 × 23 × 53

Divisors: 1, 2, 11, 22, 23, 46, 53, 106, 253, 506

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 110100011000010

Octal: 64302

Duodecimal: 1362A

Hexadecimal: 68c2

Square: 719205124

Square Root: 163.76202245942127

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

a(n) = n*(n + 1)*(5·n - 4)/2. A237616

Number of 5-tuples (v1,v2,v3,v4,v5) of nonnegative integers less than n such that v1 <= v5, v2 <= v5, v2 <= v4 and v3 <= v4. A85461

Numbers whose sum of divisors is a sixth power. A19424

Numbers whose sum of divisors is 6⁶ = 46656. A48256

a(n) = n*(n + 1)*(n² - 3·n + 6)/8. A4255

Numbers k such that k³ contains a pandigital substring. A115933

Number of distributive lattices; also number of paths with n turns when light is reflected from 11 glass plates. A30115

Duplicate of A004255. A101357

Define two triangular arrays by: B(0,0)=C(0,0)=1, B(0,r)=C(0,r)=0 for r>0, C(t,-1)=C(t,0); and for t,r >= 0, B(t+1,r)=C(t,r-1)+2C(t,r)-B(t,r), C(t+1,r)=B(t+1,r)+2B(t+1,r+1)-C(t,r). Sequence gives array B(t,r) read by rows. A177011

Numbers k such that the first k septenary digits found in the decimal expansion of π form a prime. A65575