Properties of the Number 18889

Eighteen Thousand Eight Hundred Eighty-Nine

Basics

Value: 18888 → 18889 → 18890

Parity: odd

Prime: No

Previous Prime: 18869

Next Prime: 18899

Digit Sum: 34

Digital Root: 7

Palindrome: No

Factorization: 13 × 1453

Divisors: 1, 13, 1453, 18889

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100100111001001

Octal: 44711

Duodecimal: AB21

Hexadecimal: 49c9

Square: 356794321

Square Root: 137.43725841270262

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

Triangle T(n,k) read by rows giving number of underdiagonal lattice paths from (0,0) to (n,k) using only steps R = (1,0), V = (0,1) and D = (3,1). A71946

Multilevel sieve: at k-th step, accept k numbers, reject k, accept k, ... A5209

McKay-Thompson series of class 18b for the Monster group. A58537

a(n) = 12·n² - 8·n + 9. A167585

Triangle in A071946 with rows reversed. A108076

Numbers k such that 4k+1 is a palindromic prime. A192261

Numbers n such that the trinomial xⁿ-x-1 is irreducible over GF(3). A223938

Pseudoprimes to base 60. A20188

Strong pseudoprimes to base 60. A20286

Nonzero numerators in asymptotic expansion of the Riemann-Seigel Z-function. A50276