Properties of the Number 3986

Three Thousand Nine Hundred Eighty-Six

Basics

Value: 3985 → 3986 → 3987

Parity: even

Prime: No

Previous Prime: 3967

Next Prime: 3989

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 × 1993

Divisors: 1, 2, 1993, 3986

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111110010010

Octal: 7622

Duodecimal: 2382

Hexadecimal: f92

Square: 15888196

Square Root: 63.13477647065839

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

Numbers whose Matula tree is a binary tree (i.e., root has degree 2 and all nodes except root and leaves have degree 3). A111299

Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 24. A51965

1/∏_n>=1 (1 - a(n)*xⁿ) = 1 + ∑_k>=1 F(k+1)*x^k = 1/(1-x-x²), where F(n) = A000045(n) (Fibonacci numbers). A157162

Matula-Goebel signatures for plane binary trees encoded by A014486. A127302

Numbers k such that 3^k + 20 is prime. A219040

Unitary untouchable numbers: us(x) = n has no solution where us(x) (A063919) is the sum of the proper unitary divisors of x. A63948

Number of partitions of n into 10 squarefree parts. A326626

Sum of the smallest parts of the partitions of n into 10 squarefree parts. A326628

Noncongruent squarefree numbers n with A248395(n)/d(n) = -2, where d(n) = A000005(n). A248406

Numbers k for which A003958(σ(k)) = A003958(k), where A003958 is multiplicative with a(p^e) = (p-1)^e and σ is the sum of divisors function. A351446