ℕ atory
Play Now

Properties of the Number 19644

Nineteen Thousand Six Hundred Forty-Four

Basics

Value: 19643 → 19644 → 19645

Parity: even

Prime: No

Previous Prime: 19609

Next Prime: 19661

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 2 × 3 × 1637

Divisors: 1, 2, 3, 4, 6, 12, 1637, 3274, 4911, 6548

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 100110010111100

Octal: 46274

Duodecimal: B450

Hexadecimal: 4cbc

Square: 385886736

Square Root: 140.15705476357584

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

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock summing to 5 6 or 7. A251381
a(n) = ∑k=0..7 (n + k)2. A276026
Number of integer partitions of n whose LCM is greater than n. A327779
McKay-Thompson series of class 20b for Monster. A58557
Number of (n+1)X(2+1) 0..3 arrays with every 2X2 subblock summing to 5 6 or 7. A251375
Ulam numbers u such that 5·u is also an Ulam number. A287613
Number of walks within N2 (the first quadrant of Z2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (0, 1), (1, 0)}. A151376
Number of n X n binary matrices with rows and columns each in strictly increasing order as binary numbers and every 0 adjacent to a 1 and every 1 adjacent to a 0. A181010
Number of tilings of a right isosceles triangle by n right isosceles triangular tiles of any size, such that the intersection of any two tiles is either empty, a vertex of both tiles, or an edge of both tiles. A369237
T(n,k)=number of nXk binary matrices with rows and columns each in strictly increasing order as binary numbers and every 0 adjacent to a 1 and every 1 adjacent to a 0. A181011