Properties of the Number 3870

Three Thousand Eight Hundred Seventy

Basics

Value: 3869 → 3870 → 3871

Parity: even

Prime: No

Previous Prime: 3863

Next Prime: 3877

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 5 × 43

Divisors: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 111100011110

Octal: 7436

Duodecimal: 22A6

Hexadecimal: f1e

Square: 14976900

Square Root: 62.20932405998316

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

Exponential Riordan array [1, 1/(2-e^x)-1]. A256893

Coordination sequence for "reo" 3D uniform tiling. A299279

Coordination sequence for "crs" 3D uniform tiling formed from tetrahedra and truncated tetrahedra. A299268

a(n) = 2·n² - 2. A54000

Numbers k such that 2^k + 7 is prime. A57195

Augmentation of the triangular array A158405. See Comments. A193091

Square array of coefficients in the successive iterations of x·C(x) = (1-sqrt(1-4·x))/2 where C(x) is the g.f. of the Catalan numbers (A000108); read by antidiagonals. A158825

Iterate the map in A006369 starting at 144. A185589

Numbers k such that L(2·k + 1) is prime, where L(m) is a Lucas number. A117522

Sum of terms within one periodic pattern of that sequence representing the digital sum analog base n of the Fibonacci recurrence. A131318