Properties of the Number 39987

Thirty-Nine Thousand Nine Hundred Eighty-Seven

Basics

Value: 39986 → 39987 → 39988

Parity: odd

Prime: No

Previous Prime: 39983

Next Prime: 39989

Digit Sum: 36

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 1481

Divisors: 1, 3, 9, 27, 1481, 4443, 13329, 39987

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1001110000110011

Octal: 116063

Duodecimal: 1B183

Hexadecimal: 9c33

Square: 1598960169

Square Root: 199.96749735894582

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

Let A(0) = 1, B(0) = 0 and C(0) = 0. Let B(n+1) = ∑_{k = 0..n} binomial(n,k)* A(k), C(n+1) = ∑_{k = 0..n} binomial(n,k)*B(k) and A(n+1) = ∑_{k = 0..n} binomial(n,k)*C(k). This entry gives the sequence B(n). A143816

Let A(0)=1, B(0)=0 and C(0)=0. Let B(n+1) = ∑_{k = 0..n} binomial(n,k)*A(k), C(n+1) = ∑_{k = 0..n} binomial(n,k)*B(k) and A(n+1) = ∑_{k = 0..n} binomial(n,k)*C(k). This entry gives the sequence A(n). A143815

Let A(0) = 1, B(0) = 0 and C(0) = 0. Let B(n+1) = ∑_{k = 0..n} binomial(n,k)* A(k), C(n+1) = ∑_{k = 0..n} binomial(n,k)*B(k) and A(n+1) = ∑_{k = 0..n} binomial(n,k)*C(k). This entry gives the sequence C(n). A143817

Decimal expansion of ∑_k>=0 1/(3·k)!. A143819

Decimal expansion of the constant 1/1! + 1/4! + 1/7! + ... A143820

Decimal expansion of the constant 1/2! + 1/5! + 1/8! + ... = 0.50835 81599 84216 ... . A143821

k th digit of a(n) = number of different digits within 2 places of k (not including k). A39987