7465
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 8964
- Proper Divisor Sum (Aliquot Sum)
- 1499
- 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
- 5968
- Möbius Function
- 1
- Radical
- 7465
- 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
- 70
- Smith Number
- yes
- 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
- no
- Odd
- yes
Appears in sequences
- a(n) = (5*n + 1)^2 + 4*n + 1.at n=17A007533
- Numbers k such that the continued fraction for sqrt(k) has period 3.at n=23A013643
- a(1)=1, a(n) = n*6^(n-1) + a(n-1).at n=4A014918
- Katadromes: digits in base 6 are in strict descending order.at n=61A023788
- Digit sum of 'odd' number equals digit sum of 'sum' and 'juxtaposition' of its prime factors (counted with multiplicity).at n=37A036927
- For each prime p take the sum of nonprimes < p.at n=32A045717
- Digits 1..n in strict descending order n..1 interpreted in base n+1.at n=4A051846
- 1+2n+3n^2+4n^3+5n^4.at n=6A056579
- Smallest d such that real quadratic field with discriminant d has class number n.at n=17A081364
- Numbers m such that the numerator of Sum_{i=1..m} (i-1)/i is prime.at n=53A091815
- Integer part of the area of consecutive prime sided tetragons with one right angle.at n=22A105270
- Triangle read by rows, generated from (..., 3, 2, 1).at n=49A108283
- Numbers k such that k and k^2 use only the digits 2, 4, 5, 6 and 7.at n=34A137094
- Numbers k such that continued fraction of (1 + sqrt(k))/2 has period 5.at n=43A146330
- a(n) = 25*n^2 - 36*n + 13.at n=18A154355
- Sides of squares which are filled exactly (no holes, no overlaps) by the digits needed to write a subsequence of consecutive Fibonacci numbers, starting with 0.at n=15A158027
- a(2*n+1) = 1+A131941(2*n+1). a(2*n) = A131941(2*n).at n=34A173809
- Stack polyominoes with square core.at n=39A188674
- Number of 4X2 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 4 zero-sum 2-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=24A192703
- a(n) = sum of numbers k <= sigma(n) such that k is not equal to sigma(d) for any divisor d of n where sigma = A000203.at n=47A206029