Properties of the Number 19005

Nineteen Thousand Five

Basics

Value: 19004 → 19005 → 19006

Parity: odd

Prime: No

Previous Prime: 19001

Next Prime: 19009

Digit Sum: 15

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 × 7 × 181

Divisors: 1, 3, 5, 7, 15, 21, 35, 105, 181, 543

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100101000111101

Octal: 45075

Duodecimal: ABB9

Hexadecimal: 4a3d

Square: 361190025

Square Root: 137.85862323409444

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 k and k+1 have 4 distinct prime factors. A140078

n satisfying σ(n+1) = σ(n-1). A55574

T(n,k)=Number of nXk arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor. A221125

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the upper median minus the lower median minus the minimum of every 2X2 subblock equal. A236893

One-sixth the area of the smallest primitive d-arithmetic triangle, where d=A072330(n). A72360

Numbers that are the sum of one or more consecutive squares in more than one way. A130052

Numbers that are sums of 2 or more consecutive squares in more than 1 way. A62681

Numbers k such that k and k+1 each have at least 4 distinct prime factors. A321504

Numbers k such that k and k+1 are the product of exactly four distinct primes. A318896

Triangle of coefficients T(n,k) in g.f. A(x,y) satisfying ∑_n=-oo..+oo (-1)ⁿ * (xⁿ + y·A(x,y))ⁿ = 1 + (y+2)*∑_n>=1 (-1)ⁿ * x^n², for n >= 1, as read by rows. A370040