3179
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 3684
- Proper Divisor Sum (Aliquot Sum)
- 505
- 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
- 2720
- Möbius Function
- 0
- Radical
- 187
- Omega Function (Ω)
- 3
- Little Omega Function (ω)
- 2
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
- 79
- 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
- no
- Odd
- yes
Appears in sequences
- a(n) = ceiling(1000*log(n)).at n=23A004242
- Coordination sequence for Ni2In, Position Ni1 and In.at n=17A009941
- Coordination sequence T1 for Zeolite Code MWW.at n=38A024986
- Size of lexicographic code of length n, Hamming distance 10 and weight 10.at n=33A031502
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 55.at n=14A031553
- "BGK" (reversible, element, unlabeled) transform of 1,0,1,0,...at n=46A032059
- a(n) = 11*n^2.at n=17A033584
- Number of different values of i^2 + j^2 + k^2 for i,j,k in [ 0,n ] (or [ -n,n ]).at n=41A034966
- Number of partitions of n with equal nonzero number of parts congruent to each of 1 and 3 (mod 4).at n=36A035550
- A035550 with periodic zeros stripped.at n=17A035595
- Composite numbers whose prime factors contain no digits other than 1 and 7.at n=18A036307
- Number of triples {i,j,k}, i>1, j>1, k>1, such that i*j*k < n^3.at n=9A037092
- Number of partitions satisfying cn(0,5) <= cn(2,5) and cn(0,5) <= cn(3,5).at n=29A039838
- Numbers n such that string 7,9 occurs in the base 10 representation of n but not of n-1.at n=34A044411
- Numbers n such that string 1,7 occurs in the base 10 representation of n but not of n+1.at n=35A044730
- Numbers n such that string 7,9 occurs in the base 10 representation of n but not of n+1.at n=34A044792
- Numbers whose base-5 representation contains exactly three 0's and one 1.at n=36A045170
- Numbers whose base-5 representation contains exactly three 0's and one 2.at n=35A045185
- Numbers whose base-5 representation contains exactly three 0's and one 4.at n=33A045215
- a(1)=7; if n = Product p_i^e_i, n > 1, then a(n) = Product p_{i+4}^e_i.at n=49A045970