Properties of the Number 6420

Six Thousand Four Hundred Twenty

Basics

Value: 6419 → 6420 → 6421

Parity: even

Prime: No

Previous Prime: 6397

Next Prime: 6421

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 5 × 107

Divisors: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1100100010100

Octal: 14424

Duodecimal: 3870

Hexadecimal: 1914

Square: 41216400

Square Root: 80.12490249604052

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 balls in pyramid with base either a regular hexagon or a hexagon with alternate sides differing by 1 (balls in hexagonal pyramid of height n taken from hexagonal close-packing). A19298

Numbers n that raised to the powers from 1 to k (with k>=1) are multiple of the sum of their digits (n raised to k+1 must not be a multiple). Case k=6. A135191

Record gaps between prime quadruplets. A113404

Number of subsets of {1..n} containing n such that it is possible to choose a different binary index of each element. A370639

Values of the difference d for 6 primes in geometric-arithmetic progression with the minimal sequence {7·7^j + j·d}, j = 0 to 5. A209205

Sum of the squarefree parts of the partitions of n into 4 parts. A309479

a(n) = 4·n² + floor(n/2). A173511

Numbers that are the sum of nine fifth powers in two or more ways. A345619

Numbers that are the sum of nine fifth powers in exactly two ways. A346337

Successively larger 3-ball indecomposable ground-state site swaps of A084511 in concatenated decimal notation. A84512