Properties of the Number 22785

Twenty-Two Thousand Seven Hundred Eighty-Five

Basics

Value: 22784 → 22785 → 22786

Parity: odd

Prime: No

Previous Prime: 22783

Next Prime: 22787

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 × 7 ² × 31

Divisors: 1, 3, 5, 7, 15, 21, 31, 35, 49, 93

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101100100000001

Octal: 54401

Duodecimal: 11229

Hexadecimal: 5901

Square: 519156225

Square Root: 150.94701056993478

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

Generalized Stirling number triangle of first kind read by rows: T(n, k) = [x^k] ∏_m=1..n (x - m - r), with r = 7. A51379

Numbers n such that n!10 + 2 is prime. A204657

Number of ways to place 4n rooks on n X n board, 4 rooks in each row and each column, multiple rooks in a cell allowed, and exactly 4 rooks below the main diagonal. A260584

Triangle read by rows: T(n, k) = [x^k] x·Pochhammer(n + x, n)/(n + x). A38455

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

Limiting sequence formed by rows of A094504 read backwards: rightmost floor(n/2)+1 terms of row n in table A094504. A96322

Numbers k such that 2·k-1, 4·k-1, 6·k-1 and 8·k-1 are primes. A124487

Numbers k such that 2·k-1, 4·k-1, 6·k-1, 8·k-1 and 10·k-1 are primes. A124488

The Wiener index of the Dutch windmill graph D(5,n) (n>=1). A180579

Irregular triangle read by rows: T(n, k) is the q-multinomial coefficient defined by the k-th partition of n in Abramowitz-Stegun order, evaluated at q = 2. A347485