7812
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
- 2
Divisibility
- Divisor Count
- 36
- Divisor Sum
- 23296
- Proper Divisor Sum (Aliquot Sum)
- 15484
- 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
- 2160
- Möbius Function
- 0
- Radical
- 1302
- Omega Function (Ω)
- 6
- Little Omega Function (ω)
- 4
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
- 39
- 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 ways of writing n as a sum of 6 squares.at n=25A000141
- 7th powers written backwards.at n=3A002140
- Theta series of 6-dimensional lattice A_6^(2) (other names for this lattice or the corresponding quadratic form are LAMBDA_{3,lambda}, P_6^(5), phi_6, F_14).at n=36A002706
- Powers of 3 written backwards.at n=7A004167
- Theta series of {D_6}* lattice.at n=50A008425
- a(n) = floor(n*(n - 1)*(n - 2)/32).at n=64A011914
- Numbers whose base-6 representation is the juxtaposition of two identical strings.at n=35A020334
- Sums of distinct powers of 6.at n=36A033043
- Base-6 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,0.at n=5A033142
- a(n) = 4*n*(2*n + 1).at n=31A033586
- a(n) = floor((n^3)/2).at n=25A036487
- Positive numbers having the same set of digits in base 2 and base 6.at n=32A037411
- Sums of 2 distinct powers of 6.at n=12A038478
- Numbers having four 0's in base 6.at n=15A043372
- Numbers that are repdigits in base 5.at n=22A048330
- Second pentagonal numbers with even index: a(n) = n*(6*n+1).at n=36A049453
- Sums of two powers of 6.at n=17A055257
- Product of sums of divisors and non-divisors.at n=21A066859
- Reverse of largest prime factor of n = smallest prime factor of n+1; a(1)=1.at n=9A071393
- Group successively larger composite numbers so that the sum of the n-th group is a multiple of n. Sequence gives the sum of the terms in the n-th group.at n=30A074120