Properties of the Number 9980

Nine Thousand Nine Hundred Eighty

Basics

Value: 9979 → 9980 → 9981

Parity: even

Prime: No

Previous Prime: 9973

Next Prime: 10007

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 5 × 499

Divisors: 1, 2, 4, 5, 10, 20, 499, 998, 1996, 2495

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10011011111100

Octal: 23374

Duodecimal: 5938

Hexadecimal: 26fc

Square: 99600400

Square Root: 99.89994994993741

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 integer partitions of n containing all of their distinct multiplicities. A325705

Positive integers n such that n¹⁴ + 1 is semiprime (A001358). A104335

a(n) = prime(n)² - prime(n²). Commutator of (primes, squares) at n. A123914

Sum over all partitions of n of the LCM of the parts. A181844

Array read by antidiagonals: T(n,k) is the number of connected graphs on n labeled nodes, each node being colored with one of k colors, where no edge connects two nodes of the same color. A322279

Numbers that reach the fixed point 89 under iteration of f(x) = reverse(x) - maxdigit(x). A97155

Number of unlabeled rooted trees with n nodes where the outdegrees (branching factors) of adjacent nodes differ by exactly one. A257654

Number of connected graphs on n labeled nodes, each node being colored with one of 5 colors, such that no edge joins nodes of the same color. A2030

a(n) = 25·n² - n. A157514

a(n) = 1000·n - 20. A157515