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Properties of the Number -71820

Seventy-One Thousand Eight Hundred Twenty

Basics

Value: -71821 → -71820 → -71819

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 2 × 3 3 × 5 × 7 × 19

Divisors: 1, 2, 3, 4, 5, 6, 7, 9, 10, 12

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8109 Try Today's Challenge

Representations

Binary: -10001100010001100

Octal: -214214

Duodecimal: -35690

Hexadecimal: -1188c

Square: 5158112400

Square Root: 267.99253720952754

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) = n*(n + 1)*(n + 2)*(n + 3)/2. A33486
Sum of n consecutive cubes starting from n3. A240137
Even legs of Pythagorean triangles whose other leg and hypotenuse are both prime. A67755
Triangle T, read by rows, where the matrix square T2 results in shifting T right one column to drop the secondary diagonal. A152391
Smallest number whose set of divisors contains each digit 0-9 at least n times. A59436
n sets a new record for number of iterations of A034690 (sum of digits of the divisors of n) needed to reach 15 (see A086793). A95347
Sums of consecutive noncubes. A48396
Smallest number that requires n iterations of the sum of digits of the divisors (A034690) to reach 15. A94501
Free polyominoes with 4n squares, having 90-degree rotational symmetry about a square corner. A234009
a(n) is the first number with a total of exactly n 1's in the decimal digits of its divisors. A387357