Properties of the Number 7866

Seven Thousand Eight Hundred Sixty-Six

Basics

Value: 7865 → 7866 → 7867

Parity: even

Prime: No

Previous Prime: 7853

Next Prime: 7867

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 19 × 23

Divisors: 1, 2, 3, 6, 9, 18, 19, 23, 38, 46

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 1111010111010

Octal: 17272

Duodecimal: 4676

Hexadecimal: 1eba

Square: 61873956

Square Root: 88.6904729945669

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

Values of m such that N = (am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,3. A64238

a(n) = ∑_d∣n (n/d)^n-d. A342629

a(n) = binomial(2·n,n)*(2·n+1)/2+n·binomial(2·n-2,n)+(n-1)*binomial(2·n-2,n+1). A344228

Coefficients of factor polynomials U(n,x) associated with reciprocation. A147989

a(n) = n*(4·n² - 3·n + 5)/6. A174723

Coefficients of denominator polynomials T(n,x) associated with reciprocation. A147986

Coefficients of denominator polynomials Q(n,x) associated with reciprocation. A147988

a(n) = ∑_i=0..n digsum₇(i)³, where digsum₇(i) = A053828(i). A231678

Partial sums of ceiling(n²/4). A175287

Number of matching pairs of patterns, the longest having length n. A335517