Properties of the Number 9840

Nine Thousand Eight Hundred Forty

Basics

Value: 9839 → 9840 → 9841

Parity: even

Prime: No

Previous Prime: 9839

Next Prime: 9851

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 ⁴ × 3 × 5 × 41

Divisors: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10011001110000

Octal: 23160

Duodecimal: 5840

Hexadecimal: 2670

Square: 96825600

Square Root: 99.19677414109796

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) = (3ⁿ - 3)/2. A29858

12 times triangular numbers. A49598

a(n) = n*(n+4)*(n+5)/6. A5586

MacMahon's generalized sum of divisors function. A2127

Numbers k such that k and k + 1 are both lazy-Lucas-Niven numbers (A351719). A351720

a(n) = 3*(a(n-2) + 1), with a(0) = 1, a(1) = 3. A87503

Numbers k such that σ (x) = k has exactly 11 solutions. A60678

Numbers of the form p⁴*q·r*s where p, q, r, and s are distinct primes. A179693

Natural numbers k such that k is a multiple of its number of "feasible" partitions. A254438

Expansion of (-1 + ∏_k>=1 (1 + x^k)^k)⁶. A341388