980
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 18
- Divisor Sum
- 2394
- Proper Divisor Sum (Aliquot Sum)
- 1414
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 336
- Möbius Function
- 0
- Radical
- 70
- Omega Function (Ω)
- 5
- Little Omega Function (ω)
- 3
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 23
- Smith Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Names
- German
- neunhundertachtzig· ordinal: neunhundertachtzigste
- English
- nine hundred eighty· ordinal: nine hundred eightieth
- Spanish
- novecientos ochenta· ordinal: 980º
- French
- neuf cent quatre-vingts· ordinal: neuf cent quatre-vingtsième
- Italian
- novecentoottanta· ordinal: 980º
- Latin
- nongenti octoginta· ordinal: 980.
- Portuguese
- novecentos e oitenta· ordinal: 980º
Appears in sequences
- Number of trees of diameter 4.at n=22A000094
- Number of permutations of an n-sequence discordant with three given permutations (see reference) in n-4 places.at n=3A000440
- a(n) = (2*n)!^2 / ((n+1)!*n!^3).at n=4A000888
- a(n) = (9*n+1)*(9*n+8).at n=3A001534
- Complete Post functions of n variables.at n=3A002543
- Numbers k such that (k^2 + k + 1)/19 is prime.at n=30A002643
- A binomial coefficient sum.at n=6A003161
- Numbers that are the sum of 12 positive 5th powers.at n=44A003357
- High temperature series for spin-1/2 Ising surface susceptibility on square lattice.at n=4A003489
- Numbers that are a sum of distinct positive cubes in more than one way.at n=36A003998
- a(n) = 10*a(n-1) - a(n-2); a(0) = 0, a(1) = 1.at n=4A004189
- Numbers n such that 8*3^n + 1 is prime.at n=12A005538
- An upper bound on the biplanar crossing number of the complete graph on n nodes.at n=24A007333
- Numbers k such that phi(x) = k has exactly 3 solutions.at n=38A007367
- Coordination sequence T1 for Zeolite Code ATV.at n=20A008043
- Coordination sequence T1 for feldspar.at n=21A008254
- Triangle T(n,k) read by rows, giving number of graphs with n nodes (n >= 1) and k edges (0 <= k <= n(n-1)/2).at n=74A008406
- Multiples of 20.at n=49A008602
- The problem of the calissons: number of ways to tile a hexagon of edge n with diamonds of side 1. Also number of plane partitions whose Young diagrams fit inside an n X n X n box.at n=3A008793
- Coordination sequence T1 for Zeolite Code -PAR.at n=22A009855