Properties of the Number -18580

Eighteen Thousand Five Hundred Eighty

Basics

Value: -18581 → -18580 → -18579

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 ² × 5 × 929

Divisors: 1, 2, 4, 5, 10, 20, 929, 1858, 3716, 4645

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -100100010010100

Octal: -44224

Duodecimal: -A904

Hexadecimal: -4894

Square: 345216400

Square Root: 136.3084736911099

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

Sum of squares of four consecutive primes. A133524

Number of integer partitions of n such that it is not possible to choose a different constant integer partition of each part. A387329

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of ∏_j>=1 1/(1 - j^k*x^j). A292193

Expansion of ∏_k>=1 1/(1 - k⁴*x^k). A265838

Array read by antidiagonals: T(n,k) is the number of unlabeled oriented k-gonal 2-trees with n oriented polygons, n >= 0, k >= 2. A340812

Irregular table read by rows, T(n, k) is the rank of the k-th Seidel permutation of {1,...,n}, permutations sorted in lexicographical order. A347600

A089450 indexed by A000040. A89525

The number of 1-length gaps in all possible covers of n-length line by 2-length segments. A228577

a(n) = C(n+2,3) + C(n,3) + C(n-1,3). A6004

Numbers k such that h(k) = h(k-1) + h(k-2), where h(k) = A006577(k) + 1 is the length of the sequence {k, f(k), f(f(k)), ...., 1} in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.) A78418