Properties of the Number -18860

Eighteen Thousand Eight Hundred Sixty

Basics

Value: -18861 → -18860 → -18859

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5 × 23 × 41

Divisors: 1, 2, 4, 5, 10, 20, 23, 41, 46, 82

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -100100110101100

Octal: -44654

Duodecimal: -AAB8

Hexadecimal: -49ac

Square: 355699600

Square Root: 137.33171520082314

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

Consider the nontrivial zeros of the Riemann ζ function on the critical line 1/2 + i·t and the gap, or first difference, between two consecutive such zeros; a(n) is the lesser of the two zeros at a place where the gap attains a new minimum. A254297

a(n) = T(n,n-5), array T as in A055807. A55810

T(n,k)=Number of ways to move elements of an nXnXn triangular array to themselves or a neighbor, with no 2-cycles and with no more than k-1 elements moved to themselves. A271852

a(n) is the number of 4 element sets of distinct integer sided trapezoids whose base angles are 60 degrees that fill an equilateral triangular grid of side n units. A389392

a(n) = ∑_k=0..7 (n + k)². A276026

Number of 2 X 2 matrices having all elements in {-n,...n} and determinant 4. A209988

Magnetic Tower of Hanoi, total number of moves, optimally solving the [RED ; NEUTRAL ; NEUTRAL] or [NEUTRAL ; NEUTRAL ; BLUE] pre-colored puzzle. A183116

Number of compositions (ordered partitions) of n into centered hexagonal numbers (A003215). A322802

a(n) = ∑_k=1..n binomial(k+2,2) * floor(n/k). A366984

Expansion of ∏_k>=1 (1 + 2·x^k - x^2·k). A293182