Properties of the Number 19945

Nineteen Thousand Nine Hundred Forty-Five

Basics

Value: 19944 → 19945 → 19946

Parity: odd

Prime: No

Previous Prime: 19937

Next Prime: 19949

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 5 × 3989

Divisors: 1, 5, 3989, 19945

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 100110111101001

Octal: 46751

Duodecimal: B661

Hexadecimal: 4de9

Square: 397803025

Square Root: 141.2267680009707

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

Sum of 10 nonzero 8th powers. A3388

Column 2 of triangle A091602. A91605

Number of rooted identity trees with n nodes and 3 leaves. A55328

Numbers k such that the continued fraction for sqrt(k) has period 65. A20404

Number of length n+5 0..4 arrays with some three disjoint pairs in each consecutive six terms having the same sum. A248485

Number of 2 X 2 matrices with all elements in {-n,..,0,..,n} with permanent = determinant·n. A280407

Smallest palindrome greater than n in bases n and n+1. A48268

T(n,k)=Number of length n+5 0..k arrays with some three disjoint pairs in each consecutive six terms having the same sum. A248489

Expansion of 1/∏_k>=1 (1 + k!*x^k). A292279

Decimal expansion of tangent of 47 degrees. A19945