2804
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 4914
- Proper Divisor Sum (Aliquot Sum)
- 2110
- 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
- 1400
- Möbius Function
- 0
- Radical
- 1402
- 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
- 84
- 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
- Number of bipartite partitions.at n=12A002766
- Coordination sequence T2 for Zeolite Code LTL.at n=39A008139
- Coordination sequence T4 for Zeolite Code STI.at n=36A008237
- If a, b in sequence, so is ab+4.at n=44A009303
- Fibonacci sequence beginning 4, 17.at n=12A022134
- a(n) = s(1)*t(n) + s(2)*t(n-1) + ... + s(k)*t(n+1-k), where k = floor((n+1)/2), s = A023531, t = (Lucas numbers).at n=16A024319
- 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 26.at n=29A031524
- Numbers whose set of base-7 digits is {1,4}.at n=31A032819
- Decimal part of cube root of a(n) starts with 1: first term of runs.at n=12A034127
- Maximal base 7 run length is 4.at n=10A037991
- Denominators of continued fraction convergents to sqrt(77).at n=8A041137
- Numbers whose base-7 representation contains exactly four 1's.at n=7A043400
- Numbers n such that string 5,5 occurs in the base 9 representation of n but not of n-1.at n=34A044301
- Numbers n such that string 0,4 occurs in the base 10 representation of n but not of n-1.at n=29A044336
- Numbers n such that string 5,5 occurs in the base 9 representation of n but not of n+1.at n=34A044682
- Numbers n such that string 0,4 occurs in the base 10 representation of n but not of n+1.at n=29A044717
- Numbers having, in base 14, (sum of even run lengths)=(sum of odd run lengths).at n=16A044885
- Coordination sequence T3 for Zeolite Code AEN.at n=33A047952
- Let Py(n)=A000330(n)=n-th square pyramidal number. Consider all integer triples (i,j,k), j >= k>0, with Py(i)=Py(j)+Py(k), ordered by increasing i; sequence gives j values.at n=25A053720
- n*M127 - 1 is prime, where M127 = 2^127 - 1.at n=24A057441