Properties of the Number 18425

Eighteen Thousand Four Hundred Twenty-Five

Basics

Value: 18424 → 18425 → 18426

Parity: odd

Prime: No

Previous Prime: 18413

Next Prime: 18427

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 5 ² × 11 × 67

Divisors: 1, 5, 11, 25, 55, 67, 275, 335, 737, 1675

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100011111111001

Octal: 43771

Duodecimal: A7B5

Hexadecimal: 47f9

Square: 339480625

Square Root: 135.73871960498226

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

a(2·n) = 9·2ⁿ - 7, a(2·n+1) = 3·2ⁿ⁺² - 7. A354789

Triangle T(n,k) of number of chains of length k in partitions of an n-set ordered by refinement. A331955

Expansion of (1-x+7x²)/((1-x)(1-2x)). A154251

a(1) = 3; a(n+1) = a(n)-th composite. A22451

a(n) = ∑_d∣n (-1)^n/d-1 * binomial(d+2,3). A366813

Numerators of continued fraction convergents to sqrt(886). A42712

a(n) = 1331·n - 209. A157444

Numbers m > 0 that have a divisor d > 1 with binomial(m+d, d) == 1 mod m. A290040

Row sums of triangle A129462 (v=2 member of a certain family). A129463

Second right hand column of the β triangle A160480. A160483