Properties of the Number -6420

Four Hundred Twenty

Basics

Value: -6421 → -6420 → -6419

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

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

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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

Expansion of ∑_k>=0 x^k*(k+1/2) / ∏_j=1..k (1 + j·x^j). A306704

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