7236
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
- 3
Divisibility
- Divisor Count
- 24
- Divisor Sum
- 19040
- Proper Divisor Sum (Aliquot Sum)
- 11804
- 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
- 2376
- Möbius Function
- 0
- Radical
- 402
- Omega Function (Ω)
- 6
- 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
- 57
- 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 Twopins positions.at n=19A005685
- Engel expansion of Pi.at n=10A006784
- An upper bound on the biplanar crossing number of the complete graph on n nodes.at n=38A007333
- a(n) is least k such that k and 2k are anagrams in base n (written in base 10).at n=34A023094
- Composite numbers k such that digits in k and in juxtaposition of prime factors of k are the same (apart from multiplicity).at n=13A035141
- Differences between the minimal numbers (A007416).at n=48A053213
- Numbers k such that sigma(k) = 2*usigma(k).at n=20A063880
- Number of divisors of n equals the average of distinct prime factors of n.at n=30A067547
- Records in the Conway's alimentary function A070871.at n=41A070926
- Arithmetic derivative of (prime(n)+1)*(prime(n+1)+1)/4.at n=26A079094
- Numbers n with the property that n is an anagram of the digits of the distinct prime factors of n.at n=2A096595
- Coordination sequence for octagonal tiling is a(n) + A103908(n)*sqrt(2).at n=32A103909
- a(n) = (n-3)*2^n + n*(n+3)/2 + 3.at n=9A104747
- Sum of divisors of 2^n + 3^n.at n=7A114705
- Numbers k such that the decimal digits of phi(k) are a permutation of those of k.at n=16A115921
- a(n) is the number of binary strings of length n such that no subsequence of length 4 contains 3 or more ones.at n=15A118647
- Number of deco polyominoes of area n. A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.at n=10A121691
- Partial sums of A130237.at n=42A130238
- Numbers n with property that n^2 is a sum of some 70 successive primes.at n=7A166256
- Q-residue of A049310 (triangle of coefficients of Fibonacci polynomials), where Q is the triangle given by t(n,k)=k+1 for 0<=k<=n. (See Comments.)at n=9A193663