Properties of the Number 13780

Thirteen Thousand Seven Hundred Eighty

Basics

Value: 13779 → 13780 → 13781

Parity: even

Prime: No

Previous Prime: 13763

Next Prime: 13781

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 5 × 13 × 53

Divisors: 1, 2, 4, 5, 10, 13, 20, 26, 52, 53

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11010111010100

Octal: 32724

Duodecimal: 7B84

Hexadecimal: 35d4

Square: 189888400

Square Root: 117.38824472663352

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

Numbers k such that k² divides 21^k-1. A128401

Irregular triangle T(n,k) read by rows: T(n,k) is the number of compositions of n with k descents, n>=0, 0<=k<=floor(n/3). A238344

Number of multigraphs with loops on 3 nodes with n edges. A50531

Number of two-rowed partitions of length 3. A1993

a(n) = 8·n² + 8·n + 4. A108099

Number of non-Fibonacci parts in all partitions of n. A144116

Fourth column of (1,5)-Pascal triangle A096940. A96941

Number of compositions of n with exactly two descents. A241627

Practical numbers z such that z² = x² + y² for some practical numbers·and y with gcd(x,y,z) = 4. A294112

Numbers k such that 1·k + 1, 3·k + 1, 9·k + 1, 27·k + 1 are all primes. A112041