Properties of the Number 13919

Thirteen Thousand Nine Hundred Nineteen

Basics

Value: 13918 → 13919 → 13920

Parity: odd

Prime: No

Previous Prime: 13913

Next Prime: 13921

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 31 × 449

Divisors: 1, 31, 449, 13919

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11011001011111

Octal: 33137

Duodecimal: 807B

Hexadecimal: 365f

Square: 193738561

Square Root: 117.97881165700899

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

Number of ordered quadruples (a,b,c,d) with gcd(a,b,c,d)=1 (1 <= {a,b,c,d} <= n). A82540

Geometric mean of the digits = 3. In other words, the product of the digits is = 3^k where k is the number of digits. A61427

Lucas pseudoprimes. A217120

The r-th term of the n-th row of the following array contains the sum of r successively decreasing integers beginning from n. 0 < r <= n. Sequence contains the leading diagonal. A110427

a(n) is the number of distinct solution sets to the quadratic equations u·x² + v·x + w = 0 with integer coefficients u, v, w, abs(u) + abs(v) + abs(w) <= n having a negative discriminant. A381710

a(n) = n*(29·n - 1)/2. A22286

Nonprime terms in A210494. A230214

Numbers k such that 2·k + 1 divides 2^k+1 - 1. A246648

Numbers whose sum of divisors is equal to the product of the number of divisors of their k first powers, for some k. A283758

a(n) = 3·A022004(n) + 8. A163635