Properties of the Number -18490

Eighteen Thousand Four Hundred Ninety

Basics

Value: -18491 → -18490 → -18489

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 × 5 × 43 ²

Divisors: 1, 2, 5, 10, 43, 86, 215, 430, 1849, 3698

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100100000111010

Octal: -44072

Duodecimal: -A84A

Hexadecimal: -483a

Square: 341880100

Square Root: 135.9779393872403

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

Ruth-Aaron numbers (2): sum of prime divisors of n = sum of prime divisors of n+1 (both taken with multiplicity). A39752

Numbers k such that k and k+1 are both divisible by the square of their largest prime factor. A354558

The sum of the principal diagonals of an n X n spiral. A137930

Sum of the principal diagonals of a 2n X 2n square spiral. A137931

a(n) = n * (4·n + 3)². A322675

a(n) = A152534(n,n). A346980

Numbers n, satisfying A055231(n+1) - A055231(n) = 1, and with n and n+1 not squarefree. A140394

Sequence is identical to its third differences in absolute values: a(n+k)=3a(n+k-1)-3a(n+k-2)+2a(n+k-3), k=0, 1, 2, 3, 4, a(n+5)=3a(n+4)-3a(n+3), n > 2. A132418

Half the number of length n integer sequences with sum zero and sum of squares 6272. A157588

Smallest integer m > n such that both n·m and (n+1)*(m+1) are squares. A212651