Properties of the Number 8420

Eight Thousand Four Hundred Twenty

Basics

Value: 8419 → 8420 → 8421

Parity: even

Prime: No

Previous Prime: 8419

Next Prime: 8423

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5 × 421

Divisors: 1, 2, 4, 5, 10, 20, 421, 842, 1684, 2105

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10000011100100

Octal: 20344

Duodecimal: 4A58

Hexadecimal: 20e4

Square: 70896400

Square Root: 91.76055797563569

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

Number of subset-sums of integer partitions of n. A304792

a(n) = n³ + n² + n. A27444

Numbers m such that there are precisely 20 groups of order m. A298911

Numbers k such that k² divides 13^k - 1. A128393

Arrange digits of 2ⁿ in descending order. A28910

Diagonal above the central terms of pendular trinomial triangle A119369, ignoring leading zeros. A119375

Convolution square of A255528. A278710

Array read by antidiagonals: T(n,k) (n>=1, k>=1) = number of ways to select four points from an n X k grid so that three of them form a triangle of nonzero area and the extra point is on one of the edges of the triangle. A334710

Row sums of triangle A120072 (numerator triangle for H atom spectrum). A120074

Coefficient array for certain polynomials N(4; k,x) (rising powers in x). A62751