1098
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 2418
- Proper Divisor Sum (Aliquot Sum)
- 1320
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 360
- Möbius Function
- 0
- Radical
- 366
- Omega Function (Ω)
- 4
- 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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 93
- 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
- Numbers k such that the k-th tetrahedral number is the sum of 2 tetrahedral numbers.at n=33A002311
- High-temperature series in v = tanh(J/kT) for susceptibility for the Ising model on honeycomb structure.at n=10A002910
- High-temperature series for susceptibility for the spin-1/2 Ising model on hexagonal lattice.at n=5A002919
- Self numbers divisible by sum of their digits (or, self numbers which are also Harshad numbers).at n=28A003219
- a(n) = floor(1000*log(n)).at n=2A004240
- Number of subwords of length n in infinite word generated by a -> aab, b -> b.at n=50A006697
- Number of planted trees where non-root, non-leaf nodes an even distance from root are of degree 2.at n=13A007562
- Coordination sequence T3 for Zeolite Code ATS.at n=24A008040
- Coordination sequence T1 for Zeolite Code GME and AFX.at n=25A008110
- Coordination sequence T2 for Zeolite Code MFI.at n=21A008165
- Coordination sequence T2 for Zeolite Code MTN.at n=20A008187
- Expansion of (1+x^9)/((1-x)*(1-x^2)*(1-x^3)*(1-x^4)).at n=42A008770
- Aliquot sequence starting at 1074.at n=2A014364
- Numbers k that divide s(k), where s(1)=1, s(j)=14*s(j-1)+j.at n=53A014862
- Numbers n such that phi(n) * sigma(n) + 9 is a perfect square.at n=20A015728
- Coordination sequence T2 for Zeolite Code OSI.at n=22A016431
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite VSV = VPI-7 Na26H6[Zn16Si56O144].44H2O starting from a T1 atom.at n=10A019260
- Least k such that b(k) = n, where b( ) is sequence A020944.at n=48A020948
- a(n) = n*(27*n + 1)/2.at n=9A022285
- Sum of distinct prime divisors of p(n)*p(n-1) + 1.at n=22A023529