Properties of the Number 65840

Sixty-Five Thousand Eight Hundred Forty

Basics

Value: 65839 → 65840 → 65841

Parity: even

Prime: No

Previous Prime: 65839

Next Prime: 65843

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ⁴ × 5 × 823

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000000100110000

Octal: 200460

Duodecimal: 32128

Hexadecimal: 10130

Square: 4334905600

Square Root: 256.593063039514

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

Starts of runs of 3 consecutive base φ Niven numbers (A334308). A334310

Triangular array T(n,k), read by rows: coefficients of strong divisibility sequence of polynomials p(1,x) = 1, p(2,x) = 1 + 3·x, p(n,x) = u·p(n-1,x) + v·p(n-2,x) for n >= 3, where u = p(2,x), v = 1 - x². A368150

a(n) = ∑_d∣n φ(d)*4^n/d. A54611

Triangle T(n,k) = ∑_d∣n φ(d)*k^n/d. A54618

a(n) = ∑_d∣8 φ(d)*n^8/d. A54607

a(n) = 2ⁿ + n*(n+3). A131951

a(n) = ∑_d∣n φ(n/d) * (2^d - 1). A346558

Numbers k such that the first k quaternary digits found in the base-10 expansion of π form a prime (when the decimal point is ignored). A65840