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Properties of the Number 26980

Twenty-Six Thousand Nine Hundred Eighty

Basics

Value: 26979 → 26980 → 26981

Parity: even

Prime: No

Previous Prime: 26959

Next Prime: 26981

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 2 × 5 × 19 × 71

Divisors: 1, 2, 4, 5, 10, 19, 20, 38, 71, 76

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110100101100100

Octal: 64544

Duodecimal: 13744

Hexadecimal: 6964

Square: 727920400

Square Root: 164.25589791541734

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

Numbers n such that σ(n) = 6*φ(n). A104900
T(n,k)=Number of nX(k+1) 0..3 arrays with every row least squares fitting to a positive slope straight line and every column least squares fitting to a zero or positive slope straight line, with a single point array taken as having zero slope. A223751
a(n) = 1000·n - 20. A157515
Matrix inverse of triangle A055340(n+1,k). A55347
Column 1 of triangle A055347. A55348
Numbers n such that 4·10n + 5·Rn + 4 is prime, where Rn = 11...1 is the repunit (A002275) of length n. A102993
Number of nX6 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 1 1 and 1 1 0 vertically. A207486
Number of 6 X n 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 1 1 and 1 1 0 vertically. A207491
Number of 2X(n+1) 0..3 arrays with every row least squares fitting to a positive slope straight line and every column least squares fitting to a zero or positive slope straight line, with a single point array taken as having zero slope. A223753
Number of length n+4 0..5 arrays with every five consecutive terms having four times some element equal to the sum of the remaining four. A249653