Properties of the Number -18626

Eighteen Thousand Six Hundred Twenty-Six

Basics

Value: -18627 → -18626 → -18625

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 × 67 × 139

Divisors: 1, 2, 67, 134, 139, 278, 9313, 18626

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100100011000010

Octal: -44302

Duodecimal: -A942

Hexadecimal: -48c2

Square: 346927876

Square Root: 136.47710430691296

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

Numbers k such that the k-th composition in standard order is an alternating permutation of {1..k} for some k. A349051

Number of decagons that can be formed with perimeter n. A288256

E.g.f.: exp(2 * (exp(x) - 1 - x - x² / 2)). A339014

Least increasing sequence with a(1) = 1 and Hankel transform {1,1,1,1,...}. A55877

Indices m such that A128646(m)-1 is prime, where A128646 = denominator of partial sums of 1/(p(i)-1). A137689

a(n) = (7·n+1)*(7·n+6). A1526

Smallest multiple of n-th prime which is == 1 mod (n+1)-st prime. A73603

Least number k > (2n-1) such that (2n-1)^k - 2 is prime, or 0 if no such number exists. A133856

Gog words avoiding the subpattern 312. A180349

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 113", based on the 5-celled von Neumann neighborhood. A270179