1875
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 21
- Digital Root
- 3
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 10
- Divisor Sum
- 3124
- Proper Divisor Sum (Aliquot Sum)
- 1249
- 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
- 1000
- Möbius Function
- 0
- Radical
- 15
- Omega Function (Ω)
- 5
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 174
- 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
- yes
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Numbers which are the sum of 3 nonzero 4th powers.at n=44A003337
- Numbers of the form 3^i*5^j with i, j >= 0.at n=21A003593
- Expansion of g.f. (1 - 2*x)/(1 - 5*x).at n=5A005053
- Smallest label f(T) given to a rooted tree T with n nodes in Matula-Goebel labeling.at n=14A005517
- Coordination sequence T1 for Zeolite Code YUG.at n=28A008247
- Coordination sequence T2 for Zeolite Code DFO.at n=33A009876
- Expansion of (1+2*x+3*x^2)/((1-x)*(1-x^2)^2).at n=49A014255
- Numbers k that divide s(k), where s(1)=1, s(j)=6*s(j-1)+j.at n=48A014853
- Numbers k that divide s(k), where s(1)=1, s(j)=21*s(j-1)+j.at n=20A014872
- Numbers k such that k | 14^k + 1.at n=34A015965
- Expansion of 1/((1-5*x)*(1-10*x)).at n=3A016164
- Number of ways of tiling a 2 X n rectangle with dominoes and trominoes.at n=9A019439
- Poincaré series [or Poincare series] for depths of roots in a certain root system.at n=19A019527
- a(n) = n*(n-1)^4/2.at n=6A019583
- a(n) = (d(n)-r(n))/2, where d = A026057 and r is the periodic sequence with fundamental period (0,0,1,0).at n=21A026058
- a(n) = least k such that 1+2+...+k >= 1^3 + 2^3 + ... + n^3.at n=50A027924
- Numbers k that divide the (right) concatenation of all numbers <= k written in base 5 (most significant digit on left).at n=14A029450
- Numbers k that divide the (right) concatenation of all numbers <= k written in base 25 (most significant digit on left).at n=31A029470
- PDan numbers: numbers n of the form 3^A * 5^B * 7^C * 11^D with n+-2 and n+-4 prime.at n=5A029712
- Numbers k such that k^2 is palindromic in base 8.at n=24A029805