Properties of the Number 7128

Seven Thousand One Hundred Twenty-Eight

Basics

Value: 7127 → 7128 → 7129

Parity: even

Prime: No

Previous Prime: 7127

Next Prime: 7129

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ³ × 3 ⁴ × 11

Divisors: 1, 2, 3, 4, 6, 8, 9, 11, 12, 18

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 1101111011000

Octal: 15730

Duodecimal: 4160

Hexadecimal: 1bd8

Square: 50808384

Square Root: 84.42748367682174

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

Integer averages of squares of first primes. A217601

Multiples of 12 containing a 12 in their decimal representation. A121032

Number of bipartite partitions of n white objects and 6 black ones. A2755

Composite numbers such that the square root of the sum of squares of their prime factors (with multiplicity) is an integer. A134605

Smallest k such that φ(x) = k has exactly n solutions, n>=2. A7374

Coefficients in expansion of (E₆²/E₄³)^1/16. A299857

Expansion of ∏_k>=1 (1 - x^k)¹². A735

Concentric 22-gonal numbers. A195149

T(n,k)=Number of nXk 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once. A269035

Numbers k such that σ(x) = k has exactly 8 solutions. A60664