1979
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 26
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 1980
- Proper Divisor Sum (Aliquot Sum)
- 1
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 1978
- Möbius Function
- -1
- Radical
- 1979
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- 143
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 299
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Number of mixed Husimi trees with n nodes; or polygonal cacti with bridges.at n=10A000083
- Primes of the form k^2 - k - 1.at n=24A002327
- Class 4- primes (for definition see A005109).at n=46A005112
- Coordination sequence T3 for Zeolite Code MOR.at n=29A008184
- Molien series for Weyl group E_8.at n=53A008582
- Expansion of (1+x^8)/((1-x)*(1-x^2)*(1-x^3)*(1-x^4)).at n=51A008769
- Expansion of tan(log(1+x)*cos(x)).at n=7A009649
- Coordination sequence T3 for Zeolite Code -WEN.at n=32A009864
- Numbers in which every prefix (in base 10) is 1 or a prime.at n=50A012883
- Six iterations of Reverse and Add are needed to reach a palindrome.at n=37A015984
- Primes of the form 36*n^2 - 810*n + 2753, n >= 0, sorted.at n=6A022464
- n-th prime p(k) such that p(k) + p(k+9) = p(k+3) + p(k+6).at n=25A022893
- Primes that remain prime through 2 iterations of function f(x) = 10x + 3.at n=39A023269
- Numbers that are the sum of 4 positive cubes in 3 or more ways.at n=6A025407
- Least sum of 4 positive cubes in exactly n ways.at n=3A025420
- Sum of numbers between the two n's in A026272.at n=41A026275
- Coordination sequence T2 for Zeolite Code SAT.at n=32A027374
- a(n) = n + (n+1)^2.at n=43A028387
- Palindromic primes in base 3.at n=16A029971
- Previous prime concatenated with this prime p is a prime.at n=42A030460