Properties of the Number -9945

Nine Hundred Forty-Five

Basics

Value: -9946 → -9945 → -9944

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 5 × 13 × 17

Divisors: 1, 3, 5, 9, 13, 15, 17, 39, 45, 51

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

5184 Try Today's Challenge

Representations

Binary: -10011011011001

Octal: -23331

Duodecimal: -5909

Hexadecimal: -26d9

Square: 98903025

Square Root: 99.72462083156798

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

Triangle T(n, k, m) = t(n,m)/( t(k,m) * t(n-k,m) ) with T(n, 0, m) = T(n, n, m) = 1, where t(n, m) = ∏_j=1..n ∏_i=1..j-1 ( 1 - (m+1)*(2·i-1) ) and m = 1, read by rows. A156696

Coefficient array of orthogonal polynomials P(n,x)=x·P(n-1,x)-(2n-3)*P(n-2,x), P(0,x)=1,P(1,x)=x. A178103

Number of polynomial symmetric functions of matrix of order n under separate row and column permutations. A7716

Quartic (or 4-fold) factorial numbers: a(n) = ∏_{k = 0..n-1} (4·k + 1). A7696

Quadruple factorial numbers n!!!!: a(n) = n·a(n-4). A7662

Triangle read by rows, the Bell transform of the quartic factorial numbers A007696(n+1) without column 0. A49029

Array read by antidiagonals upwards where A(n, k) is the number of non-isomorphic multiset partitions of weight n with k levels of brackets. A306186

Numbers k such that σ(k) = σ(k+7). A15867

Number T(n,k) of sets of nonempty words with a total of n letters over k-ary alphabet such that all k letters occur at least once in the set; triangle T(n,k), n>=0, 0<=k<=n, read by rows. A319501

Numbers n for which nontrivial positive magic squares of exactly 10 different orders with magic sum n exist. For a definition of nontrivial positive magic squares, see A125005. A125017