Properties of the Number 19227

Nineteen Thousand Two Hundred Twenty-Seven

Basics

Value: 19226 → 19227 → 19228

Parity: odd

Prime: No

Previous Prime: 19219

Next Prime: 19231

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 13 × 17 × 29

Divisors: 1, 3, 13, 17, 29, 39, 51, 87, 221, 377

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100101100011011

Octal: 45433

Duodecimal: B163

Hexadecimal: 4b1b

Square: 369677529

Square Root: 138.6614582355169

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

a(n) = 13·a(n-1) - 65·a(n-2) + 156·a(n-3) - 182·a(n-4) + 91·a(n-5) - 13·a(n-6), with initial terms 0, 0, -1, -8, -45, -221. A216540

Numbers k such that the central binomial coefficient C(2k,k) is divisible by k². A121943

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

Number of finite even-length multisets of positive integers whose right half sums to n. A360956

Number of Carmichael numbers between 2ⁿ and 2ⁿ⁺¹. A182490

Numbers m such that the product m*(m+1) has a set of prime divisors, from greatest down to 2, that is missing exactly two prime divisors. A391970

Expansion of (1/x) * Series_Reversion( x * (1-x+x²)³ ). A368971

a(n) = (2·n³ + 5·n² - 3·n)/2. A162256

a(n) = (n+1)*∑_k=0..(n-1)/2 (binomial(k+1,n-2·k-1)*binomial(2·k,k)/(k+1)²). A270709