Properties of the Number 3861

Three Thousand Eight Hundred Sixty-One

Basics

Value: 3860 → 3861 → 3862

Parity: odd

Prime: No

Previous Prime: 3853

Next Prime: 3863

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 11 × 13

Divisors: 1, 3, 9, 11, 13, 27, 33, 39, 99, 117

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 111100010101

Octal: 7425

Duodecimal: 2299

Hexadecimal: f15

Square: 14907321

Square Root: 62.13694553162394

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 nodes in regular n-gon with all diagonals drawn. A7569

Second heptagonal numbers: a(n) = n*(5·n+3)/2. A147875

Triangle T(n,k), 0 <= k <= n, read by rows, defined by: T(0,0) = 1, T(n,k) = 0 if n<k, T(n,0) = T(n-1,0) + T(n-1,1) and for k >= 1: T(n,k) = T(n-1,k-1) + x·T(n-1,k) + T(n-1,k+1) with x = 3. A110877

Indices of primes followed by a gap (distance to next larger prime) of 44. A320720

Numbers m such that there are precisely 14 groups of order m. A294155

4-dimensional figurate numbers: a(n) = (5·n-1)*binomial(n+2,3)/4. A2418

a(n) = n*(7·n+3)/2. A186029

a(n) = 3·n*(n+6). A140681

T(n,k)=Number of nXk 0..1 arrays with no element less than a strict majority of its horizontal, diagonal and antidiagonal neighbors. A231523

Divisors of 999999. A27892