1942
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2916
- Proper Divisor Sum (Aliquot Sum)
- 974
- 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
- 970
- Möbius Function
- 1
- Radical
- 1942
- Omega Function (Ω)
- 2
- 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
- 37
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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 positive integers <= 2^n of form x^2 + 16*y^2.at n=14A000018
- Numbers k such that phi(2k+1) < phi(2k).at n=24A001837
- Numbers k for which 10k+1, 10k+3, 10k+7 and 10k+9 are primes.at n=17A007811
- Coordination sequence T4 for Zeolite Code NES.at n=28A008208
- Year of birth of n-th President of U.S.A.at n=45A008745
- Coordination sequence T2 for Zeolite Code RUT.at n=29A009898
- Coordination sequence T4 for Zeolite Code RUT.at n=29A009900
- a(n) = floor(n*(n-1)*(n-2)/24).at n=37A011842
- a(n)=a(n-1)+a(n-4).at n=23A014098
- Expansion of 1/((1-x)*(1-6*x)*(1-9*x)).at n=3A016244
- Numbers k such that the continued fraction for sqrt(k) has period 30.at n=21A020369
- Length of n-th term of A006711.at n=26A022476
- a(n) = 1*t(n) + 2*t(n-1) + ... + k*t(n+1-k), where k=floor((n+1)/2) and t is A000201 (lower Wythoff sequence).at n=22A023866
- a(n) = [ (2nd elementary symmetric function of S(n))/(first elementary symmetric function of S(n)) ], where S(n) = {first n+1 positive integers congruent to 1 mod 4}.at n=43A024385
- a(n) = position of the n-th n in A026400.at n=40A026403
- 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 44.at n=1A031542
- Number of binary codes (not necessarily linear) of length n with 3 words.at n=37A034198
- Dirichlet convolution of primes (A000040) with themselves.at n=39A034696
- E.g.f.: exp((exp(p*x)-p-1)/p+exp(x)) for p=9.at n=4A036079
- Number of partitions of n such that cn(1,5) <= cn(0,5) = cn(2,5) <= cn(3,5) = cn(4,5).at n=61A036849