3874
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 6300
- Proper Divisor Sum (Aliquot Sum)
- 2426
- 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
- 1776
- Möbius Function
- -1
- Radical
- 3874
- Omega Function (Ω)
- 3
- 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
- 51
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- yes
- 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
- Number of points on surface of tetrahedron; coordination sequence for sodalite net (equals 2*n^2+2 for n > 0).at n=44A005893
- Coordination sequence T1 for Zeolite Code DDR.at n=39A008071
- Coordination sequence T3 for Zeolite Code THO.at n=44A008240
- Coordination sequence for body-centered tetragonal lattice.at n=22A008527
- Coordination sequence T1 for Zeolite Code VET.at n=37A009902
- a(0) = 1, a(n) = 32*n^2 + 2 for n > 0.at n=11A010021
- a(1)=1, a(n) = 15*a(n-1) + n.at n=3A014898
- Number of partitions of n into distinct parts, none being 4.at n=55A015746
- Numbers k such that the continued fraction for sqrt(k) has period 17.at n=23A020356
- Number of ordered multigraphs on n labeled edges (without loops).at n=5A020558
- Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 4.at n=30A031417
- Numbers each of whose runs of digits in base 12 has length 2.at n=31A033010
- Positive integers having more base-12 runs of even length than odd.at n=33A044838
- Numbers whose base-5 representation contains exactly two 1's and three 4's.at n=14A045258
- Composite numbers whose 3 prime factors are distinct in length.at n=35A046443
- Take the first n numbers written in base 15, concatenate them, then convert from base 15 to base 10.at n=3A048446
- a(n) = a(n-1) + a(m) for n >= 4, where m = 2*n - 3 - 2^(p+1) and p is the smallest integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = a(2) = a(3) = 1.at n=39A050024
- a(n) = a(n-1) + a(m) for n >= 4, where m = 2*n - 3 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 1.at n=39A050040
- a(n) = a(n-1) + a(m) for n >= 4, where m = 2*n - 3 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 3, and a(3) = 1.at n=39A050056
- Twice partitioned numbers: the number of ways a number can be partitioned into not necessarily different parts and each part is again so partitioned.at n=12A063834