Properties of the Number 19894

Nineteen Thousand Eight Hundred Ninety-Four

Basics

Value: 19893 → 19894 → 19895

Parity: even

Prime: No

Previous Prime: 19891

Next Prime: 19913

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 2 × 7 ³ × 29

Divisors: 1, 2, 7, 14, 29, 49, 58, 98, 203, 343

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

603 Try Today's Challenge

Representations

Binary: 100110110110110

Octal: 46666

Duodecimal: B61A

Hexadecimal: 4db6

Square: 395771236

Square Root: 141.04609175726918

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

a(n) = n*(n+1)*(5·n+7)/6. A162148

Apply partial sum operator 5 times to partition numbers. A120477

a(n) = ∑_{k=0..floor(n/3)} binomial(3·k,3*(n-3·k)). A391904

a(n) = 49*(n-1)*(n-2)/2. A27469

Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=3, r=3, I={-2,0,1,2}. A79981

Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of (f(i,j)), where f(i,1)=f(1,j)=1, f(i,i)= i; f(i,j)=0 otherwise; as in A204179. A204180

Number of primes of the form (x+1)¹¹ - x¹¹ less than 10ⁿ. A221983

Numbers n such that 2·n + prime(n) is a square. A256246

A nonlinear recurrence. A3073

a(2·n) = floor( 17·2ⁿ/14 ), a(2·n+1) = floor( 12·2ⁿ/7 ). A3143