Properties of the Number 18409

Eighteen Thousand Four Hundred Nine

Basics

Value: 18408 → 18409 → 18410

Parity: odd

Prime: No

Previous Prime: 18401

Next Prime: 18413

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 41 × 449

Divisors: 1, 41, 449, 18409

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011111101001

Octal: 43751

Duodecimal: A7A1

Hexadecimal: 47e9

Square: 338891281

Square Root: 135.67977004697494

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

Composite and every divisor (except 1) contains the digit 4. A62670

Semiprimes in A056109. A113528

Iccanobirt numbers (6 of 15): a(n) = R(a(n-1)) + R(a(n-2)) + a(n-3), where R is the digit reversal function A004086. A102116

G.f. A(x) satisfies: A(x) = exp( ∑_k>=1 (-1)^k+1 * A(x^k)³ * x^k / k ). A52755

Numbers k such that A276086(k) is a multiple of A003415(k) and A276087(k) is a multiple of A327859(k). A393071

Number of 5k+2 primes (A030432) in range [2ⁿ,2ⁿ⁺¹]. A95022

Numbers k such that 4k+1 is a palindromic prime. A192261

Number of partitions of n with difference 5 between the number of odd parts and the number of even parts, both counted without multiplicity. A242696

G.f.: A(x) = ∑_n>=0 xⁿ * (1 + (-1)ⁿ * A(x))ⁿ / (1 - (-1)ⁿ * x·A(x))ⁿ⁺¹. A325157

Iccanobirt semiprimes (6 of 15): Semiprime numbers in A102116. A102196