Properties of the Number -18729

Eighteen Thousand Seven Hundred Twenty-Nine

Basics

Value: -18730 → -18729 → -18728

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 2081

Divisors: 1, 3, 9, 2081, 6243, 18729

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -100100100101001

Octal: -44451

Duodecimal: -AA09

Hexadecimal: -4929

Square: 350775441

Square Root: 136.85393673548452

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

Base numbers of 9-gonal palindromic numbers. A55560

Triangle read by rows: T(i,j) for the recurrence T(i,j) = (T(i-1,j) + 1)*i. A121662

Triangle read by rows: T(m,n) = ∑_i=1..n P(m,i) where P(m,n) = m!/(m-n)! is the number of permutations of m items taken n at a time, for 1 <= n <= m. A285268

Number of length 2+2 0..n arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero. A250321

Number of binary arrays of length n+7 with no more than 4 ones in any length 8 subsequence (=50% duty cycle). A212398

Numbers k such that 25^k - 5^k - 1 is prime. A265483

Numbers k that end with ( sum of digits of k )². A270343

The number of n-cell polyominoes with a line of symmetry parallel to the edges. A343562