Properties of the Number 19686

Nineteen Thousand Six Hundred Eighty-Six

Basics

Value: 19685 → 19686 → 19687

Parity: even

Prime: No

Previous Prime: 19681

Next Prime: 19687

Digit Sum: 30

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 17 × 193

Divisors: 1, 2, 3, 6, 17, 34, 51, 102, 193, 386

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110011100110

Octal: 46346

Duodecimal: B486

Hexadecimal: 4ce6

Square: 387538596

Square Root: 140.30680667736686

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

Partial sums of A001157: ∑_j=1..n sigma₂(j). A64602

Numbers that are the sum of 6 nonzero 8th powers. A3384

Numbers that are the sum of 4 positive 9th powers. A3393

Number of partitions of n having depth 1; see Comments. A237685

Sums of two powers of 3. A55235

Factorial splitting: write n! = x·y*z with x<y<z and·maximal and z is minimal; sequence gives value of z-x. A61033

Sums of 2 distinct powers of 3. A38464

Sum of terms in each group in A074147. A74149

Square array T(n,k), n >= 1, k >= 1, read by antidiagonals, where T(n,k) = ∑_{1 <= x₁, x₂, ..., x_k <= n} gcd(x₁, x₂, ..., x_k). A344479

a(n) = n³ + 3. A84378