Properties of the Number -3861

Eight Hundred Sixty-One

Basics

Value: -3862 → -3861 → -3860

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

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

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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

a(n) = 6·a(n-1) - 9·a(n-2) + 3·a(n-3). A216757

Expansion of e.g.f. ∏_k>=1 exp(1 - exp(x^k/k)). A346057

Expansion of ∏_k>=1 (1 + x^3·k)^3·k / (1 + x^k)^k. A285294

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 123", based on the 5-celled von Neumann neighborhood. A270213

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