Properties of the Number 3866

Three Thousand Eight Hundred Sixty-Six

Basics

Value: 3865 → 3866 → 3867

Parity: even

Prime: No

Previous Prime: 3863

Next Prime: 3877

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 × 1933

Divisors: 1, 2, 1933, 3866

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111100011010

Octal: 7432

Duodecimal: 22A2

Hexadecimal: f1a

Square: 14945956

Square Root: 62.177166226839255

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 partitions of n into parts 3k and 3k+1 with at least one part of each type. A35618

Expansion of x⁹/((1-x)*(1-x²)*(1-x³))². A117485

Second numbers F = a(n) of two non-consecutive numbers (E, F) different from (C, D) = (A352222(n), A352223(n)), such that the sums of their cubes are equal to centered cube numbers and to at least one other sum of two cubes, i.e. A = B³ + (B+1)³ = C³ + D³ = E³ + F³. A352225

Semiprimes sandwiched between semiprimes. A86005

a(n) = 2*(n² + 2·n - 2). A152811

T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 0 vertically. A207242

a(n) = A341529(n) - A341528(n) = (σ(n)*A003961(n)) - (n*σ(A003961(n))). A341512

T(n,k)=Number of length n 1..(k+1) arrays with every leading partial sum divisible by 2 or 3. A257062

Numbers n such that n-1, n and n+1 are all squarefree semiprimes. A248201

One of the two successive approximations up to 3ⁿ for the 3-adic integer sqrt(-2). These are the numbers congruent to 2 mod 3 (except for the initial 0). A271222