Properties of the Number 19784

Nineteen Thousand Seven Hundred Eighty-Four

Basics

Value: 19783 → 19784 → 19785

Parity: even

Prime: No

Previous Prime: 19777

Next Prime: 19793

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 2 ³ × 2473

Divisors: 1, 2, 4, 8, 2473, 4946, 9892, 19784

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110101001000

Octal: 46510

Duodecimal: B548

Hexadecimal: 4d48

Square: 391406656

Square Root: 140.65560778013793

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 5^k - 2 is prime. A109080

Triangle read by rows: T(n,k) is the number of secondary structures of size n (n>=0) having k stacks of length 1 (k>=0). A202838

A Wallis pair (x,y) satisfies σ(x²) = σ(y²); sequence gives y's for indecomposable Wallis pairs with x < y (ordered by values of x). A75769

Number of partitions p of n such that 3·min(p) is a part of p. A238590

p-INVERT of the triangular numbers (A000217), where p(S) = 1 - S - S². A289797

Super-4 Numbers (4·n⁴ contains substring '4444' in its decimal expansion). A32744

a(n) = ∑_k=1..n 3^floor(n/k - 1). A345029

Triangle read by rows: T(n,k) is the number of 4-ary strings of length n with k indispensable digits, with 0 <= k <= n. A330509

Number of -2..2 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^t+u+v) having four, five, six or seven distinct values for every i,j,k<=n. A211584

Numbers k such that 12·3^k + 1 is prime. A216889