1478
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 2220
- Proper Divisor Sum (Aliquot Sum)
- 742
- 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
- 738
- Möbius Function
- 1
- Radical
- 1478
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 21
- 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 nonequivalent dissections of an n-gon into n-4 polygons by nonintersecting diagonals up to rotation and reflection.at n=6A003450
- a(n) = ceiling(1000*log_10(n)).at n=29A004227
- Numbers not of form p + 2^x + 2^y.at n=28A006286
- Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite ERI = Erionite (Na2,Ca..)3.5K2[Al9Si27O72].27H2O starting with a T1 atom.at n=4A019015
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite EUO = EU-1 Nan[AlnSi112-nO224] starting with a T6 atom.at n=10A019125
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MTT = ZSM-23 Nan[AlnSi24-nO48] starting with a T6 atom.at n=10A019191
- a(n+1) = a(n) converted to base 10 from base 9 (written in base 10).at n=39A023392
- a(n) = [ 1/(2*t(n+1) - t(n) - t(n+2)) ], where t(n) = tan(Pi/2 - 1/n) satisfies n-1 < t(n) < n for all n >= 1.at n=8A024817
- a(n) = T(n,m) + T(n,m+1) + ... + T(n,n), m=[ (n+1)/2 ], T given by A026769.at n=11A026891
- Near Cullen numbers: k such that (k+1)*2^k + 1 is prime.at n=17A029544
- Q(sqrt(n)) has class number 3.at n=26A029703
- 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 38.at n=4A031536
- Numbers whose base-5 expansions have 5 distinct digits.at n=34A031946
- Numbers k such that 93*2^k+1 is prime.at n=21A032396
- Numbers k such that 169*2^k+1 is prime.at n=11A032461
- If d,e are consecutive digits of n in base 8, then |d-e|>=5.at n=50A032996
- a(0)=2; a(n) is the smallest k > a(n-1) such that the fractional part of k^(1/8) starts with n.at n=49A034073
- a(0)=2; a(n) is the smallest k > a(n-1) such that the fractional part of k^(1/9) starts with n.at n=25A034074
- a(n) = least integer m such that the part after the decimal point of the n-th root of m starts with the digit 5.at n=16A034082
- Multiplicity of highest weight (or singular) vectors associated with character chi_36 of Monster module.at n=33A034424