Properties of the Number 13787

Thirteen Thousand Seven Hundred Eighty-Seven

Basics

Value: 13786 → 13787 → 13788

Parity: odd

Prime: No

Previous Prime: 13781

Next Prime: 13789

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 17 × 811

Divisors: 1, 17, 811, 13787

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11010111011011

Octal: 32733

Duodecimal: 7B8B

Hexadecimal: 35db

Square: 190081369

Square Root: 117.41805653305627

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

Strings of 5 digits from 1...9, such that no formula using the single digits in the given order exists that evaluates to 0. A288355

Numbers k such that k·2^m+1 are composites for all exponents m in the range 0<=m<=k. A61153

a(n) = n*(25·n - 39)/2. A263231

Positive numbers k such that k and 5·k are anagrams in base 9 (written in base 9). A23082

6n-1,6n+1, 6n+5, 6n+7 are all primes. That is they are adjacent pairs of twin primes. A178145

Smallest k such that 39^k mod k = n. A178200

Number of 4 X n arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..1 4 X n array. A220034

Take a squarefree semiprime and take the difference of its prime factors. If it is a squarefree semiprime repeat the process. Sequence lists the squarefree semiprimes that generate other squarefree semiprimes only in the first k steps of this process. Case k = 4. A296811

a(n) = A027082(n, 2n-4). A27091

Sum of the prime(n) primes following prime(n). A99274