Properties of the Number -43687

Forty-Three Thousand Six Hundred Eighty-Seven

Basics

Value: -43688 → -43687 → -43686

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 7 × 79 ²

Divisors: 1, 7, 79, 553, 6241, 43687

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -1010101010100111

Octal: -125247

Duodecimal: -21347

Hexadecimal: -aaa7

Square: 1908553969

Square Root: 209.01435357410264

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(0)=a(1)=1, a(n) = 2·a(n-1)- A010686(n), n>1. A173114

a(n) = ∑_k=1..n k²*τ(k), where τ is A000005. A319085

Numbers k such that σ(k) = ψ(k) + τ(k) + ω(k). A386637

a(0) = 3, a(1) = 5, a(2) = 1, and a(n) = (2^{1 + n} - 11*(-1)ⁿ)/3 for n > 2. A115335

Composite numbers whose prime factors have no digits other than 7's and 9's. A36324

Number of Barlow packings with group P3(bar)m1(SO) that repeat after 2n-1 layers. A11950

Row sums of array T as in A054110. A54111

Number of semi-magic 3-dimensional hypercubes with 27 entries and magic sum n. A111085

Numbers n such that (6k-1) for k=n, n+1, n+2, n+3 are all primes with no primes of the form (6k+1) in between. A296011

Numbers that can be written as a² + 3·b² for some a, b in A155716 and also as c² + 6·d² for some c, d in A092572. A380295