Properties of the Number 19428

Nineteen Thousand Four Hundred Twenty-Eight

Basics

Value: 19427 → 19428 → 19429

Parity: even

Prime: No

Previous Prime: 19427

Next Prime: 19429

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 ² × 3 × 1619

Divisors: 1, 2, 3, 4, 6, 12, 1619, 3238, 4857, 6476

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100101111100100

Octal: 45744

Duodecimal: B2B0

Hexadecimal: 4be4

Square: 377447184

Square Root: 139.3843606722074

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 m having the same sum of divisors as m+20 has. A181647

Triangle read by rows: T(n,m) (n >= m >= 1) = number of line segments formed by drawing the lines connecting any two of the 2*(m+n) perimeter points of an m X n grid of squares. A331454

a(n) is the determinant of the 2 X 2 matrix whose entries (when read by rows) are the n-th primes ending in 1, 3, 7, 9 respectively. A335592

Numbers n such that n²⁰⁴⁸ + (n+1)²⁰⁴⁸ is prime. A274235

Numbers missing from A001033 despite satisfying the necessary congruence conditions (see comments). A274470

Expansion of (1-2·x)/((1-x)³*(1-4·x)). A28814

a(n) = 1 - 2ⁿ⁺¹ + 3ⁿ⁺². A185940

Numbers n such that n is the average of four consecutive primes n-5, n-1, n+1 and n+5. A258088

a(n) is the optimal wire-length for an n X n grid. A195647

Continued fraction for tan(1/5). A19428