Properties of the Number 42240

Forty-Two Thousand Two Hundred Forty

Basics

Value: 42239 → 42240 → 42241

Parity: even

Prime: No

Previous Prime: 42239

Next Prime: 42257

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ⁸ × 3 × 5 × 11

Divisors: 1, 2, 3, 4, 5, 6, 8, 10, 11, 12

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1010010100000000

Octal: 122400

Duodecimal: 20540

Hexadecimal: a500

Square: 1784217600

Square Root: 205.52372125864207

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(n) = binomial(n,3)*2^n-3. A1789

a(n) = 2^n-4*C(n,4). A3472

Consider the base-9 Kaprekar map n->K(n) defined in A165110. Sequence gives numbers belonging to cycles, including fixed points. A165115

Number of n-step polygons on f.c.c. lattice. A2899

Consider the base-9 Kaprekar map n->K(n) defined in A165110. Sequence gives numbers belonging to cycles of length greater than 1. A165117

Dates after Jan 01 00 in chronological order which are palindromic when they are written according to the format MMDDYY (American standard, short). Leading zeros of the terms are suppressed. A210895

Integer coefficient array for polynomials related to the minimal polynomials of cos(2Pi/n). Rising powers of x. A181877

Triangle read by rows: T(n, k) is the coefficient of x^k in the polynomial 1 - ChT(n, x^1/2)², where ChT(n, x) is the n-th Chebyshev polynomial of the first kind, evaluated at x (0 <= k <= n). A123588

Triangle read by rows: T(n,k) is the number of tree-rooted planar maps with n edges, k faces and no isthmuses, n >= 0, k = 1..n+1. A342987

a(n) = 2ⁿ*n!*(2·n+1). A14481