Properties of the Number 9640

Nine Thousand Six Hundred Forty

Basics

Value: 9639 → 9640 → 9641

Parity: even

Prime: No

Previous Prime: 9631

Next Prime: 9643

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ³ × 5 × 241

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 241, 482

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10010110101000

Octal: 22650

Duodecimal: 56B4

Hexadecimal: 25a8

Square: 92929600

Square Root: 98.18350166906862

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

4-dimensional analog of centered polygonal numbers. A6325

Second pentagonal numbers with even index: a(n) = n*(6·n+1). A49453

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

Arrange digits of 2ⁿ in descending order. A28910

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 3 4 6 or 7. A252130

a(1)=1. a(n) = a(n-1) + sum of the squares which are among the first (n-1) terms of the sequence. A101135

The number of even prime gaps g satisfying g == 2 (mod 6) out of the first 2ⁿ even prime gaps. A341531

Number of integer partitions of n that contain at least one even part and whose halved even parts are relatively prime. A366845

Number of isomorphism classes of nanocones with 3 pentagons and a nearsymmetric boundary of length n. A198014

Inverse Mobius transformation of A338164. A360428