1340
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 8
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 2856
- Proper Divisor Sum (Aliquot Sum)
- 1516
- 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
- 528
- Möbius Function
- 0
- Radical
- 670
- Omega Function (Ω)
- 4
- 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
- 70
- Smith Number
- no
- Vampire 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
Appears in sequences
- Numbers k such that 5*2^k - 1 is prime.at n=17A001770
- Numbers of the form (p^2 - 1)/120 where p is 1 or prime.at n=35A002381
- Number of minimal covers of an n-set that cover exactly 3 points uniquely.at n=3A003467
- Number of rooted maps with n edges on Klein bottle.at n=2A006344
- Cald's sequence: a(n+1) = a(n) - prime(n) if that value is positive and new, otherwise a(n) + prime(n) if new, otherwise 0; start with a(1)=1.at n=130A006509
- Coordination sequence T1 for Zeolite Code EPI.at n=23A008090
- Coordination sequence T2 for Zeolite Code LAU.at n=26A008125
- Coordination sequence T3 for Zeolite Code LAU.at n=26A008126
- Coordination sequence T5 for Zeolite Code NON.at n=22A008216
- Coordination sequence for 10-dimensional cubic lattice.at n=3A008420
- a(n) = n OR n^3 (applied to ternary expansions).at n=10A008469
- If a, b in sequence, so is ab+4.at n=26A009303
- Coordination sequence T5 for Zeolite Code DFO.at n=28A009879
- Coefficients in expansion of sqrt(2) as Sum_{n>=1} a(n)/(n*n!*(n+1)!), as found by greedy algorithm.at n=42A011193
- Alternating Engel expansion of Pi.at n=7A014014
- Numbers n such that phi(n) * sigma(n) + 16 is a perfect square.at n=32A015729
- Coordination sequence T1 for Zeolite Code OSI.at n=24A016430
- Number of lines through exactly 10 points of an n X n grid of points.at n=57A018817
- a(n) = a(n-1) + c(n-1) for n >= 2, a( ) increasing, given a(1)=3, where c( ) is complement of a( ).at n=46A022935
- Positive numbers k such that k and 3*k are anagrams in base 9 (written in base 9).at n=10A023080