Properties of the Number -18787

Eighteen Thousand Seven Hundred Eighty-Seven

Basics

Value: -18788 → -18787 → -18786

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 18787

Divisors: 1, 18787

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -100100101100011

Octal: -44543

Duodecimal: -AA57

Hexadecimal: -4963

Square: 352951369

Square Root: 137.0656776877421

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

Initial term in sequence of four consecutive primes whose consecutive differences have d-pattern = [6, 4, 6]; short d-string notation for pattern = [646]. A78856

Least prime p such that (p,q) is a Double Wieferich prime pair for q=A124121(n). A124122

Primes p such that p is the largest member of a Wieferich tuple. A297846

Primes having only {1, 7, 8} as digits. A260892

Primes p such that p = q² + 2·r² where q and r are also primes. A260553

Primes p such that a prime q < p exists with p^q-1 == 1 (mod q²) and q^p-1 == 1 (mod p²), i.e., primes that are the larger member of a double Wieferich prime pair. A266829

T(n,k)=Number of nXk arrays of occupancy after each element moves to some horizontal or vertical neighbor, without move-in move-out left turns. A221676

Primes in which the digit string can be partitioned into three parts such that third (least significant) part is the product of the first two. A88294

Primes with digit sum = 31. A106767

Primes of the form p² + 2q² with p and q odd primes. A201613