Properties of the Number 989

Nine Hundred Eighty-Nine

Basics

Value: 988 → 989 → 990

Parity: odd

Prime: No

Previous Prime: 983

Next Prime: 991

Digit Sum: 26

Digital Root: 8

Palindrome: Yes

Factorization: 23 × 43

Divisors: 1, 23, 43, 989

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111011101

Octal: 1735

Duodecimal: 6A5

Hexadecimal: 3dd

Square: 978121

Square Root: 31.448370387032774

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

a(n) = n*(n+3)/2. A96

Start with 1 and repeatedly reverse the decimal digits and add 4 to get the next term. A117828

a(0) = 1, a(1) = 5, a(n) = 4·a(n-1) - a(n-2). A1834

Number of reduced words of length n in the Weyl group D₄₄. A162413

a(n) = n*(2·n-3). A14107

Number of partitions p of n such that (number of even numbers in p) = (number of odd numbers in p). A241638

a(n) = (n+1)*(2-n)/2. A80956

Numbers palindromic in bases 10 and 17. A97855

a(2·n) = a(2·n-1) + a(2·n-2), a(2·n+1) = 2·a(2·n) + a(2·n-1); a(0) = a(1) = 1. A2531

Numbers that are the sum of 9 positive 6th powers. A3365