7769
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 29
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 5
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 8244
- Proper Divisor Sum (Aliquot Sum)
- 475
- 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
- 7296
- Möbius Function
- 1
- Radical
- 7769
- 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
- 114
- 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
- no
- Odd
- yes
Appears in sequences
- Numbers having four 5's in base 6.at n=19A043392
- Fourth column (r=3) of FS(3) staircase array A062745.at n=33A062748
- Antidiagonal sums of table A083047.at n=13A083049
- Structured heptagonal diamond numbers (vertex structure 5).at n=16A100179
- Let b(0)=1/2, b(n) = b(n-1) + Prime[n]/2; a(n)=b(2*n).at n=40A112039
- Numbers m such that (15m-4, 15m-2, 15m+2, 15m+4) is a prime quadruple.at n=39A112540
- Sum of the cubes of the first n cubefree numbers.at n=12A114286
- a(n) = n^5 - n - 1.at n=5A126426
- Exactly 10 consecutive odd integers starting with n are composite.at n=39A162023
- a(1)=a(2)=a(3)=1, a(4)=3; thereafter a(n) = a(n-1) + a(n-3).at n=24A179070
- Product of exactly two distinct primes congruent to 1 mod 8 (A007519).at n=25A185377
- Numbers k such that sum_{i=1..k} d(i)^2 is a square c^2, where d(i) is the number of divisors of i.at n=12A186429
- Numbers which contain only the digit 5 in their base-6 representation, with at most one exception. If the exception is the most-significant digit, it must be the digit 1, 2, 3, or 4, otherwise the exception must be the digit 4.at n=32A188532
- Partial sums of the union of squares and triangular numbers.at n=47A193711
- Number of distinct bags of distinct sequences of 1s and 2s such that the sum of all terms is n.at n=13A200544
- Numerator of Sum_{k=1..n}(-1)^k/phi(k), where phi = A000010.at n=27A211177
- a(n) = (-1)^(n-3)*binomial(n,3) - 1.at n=34A216414
- Numbers k such that 27*k+1 is a square.at n=33A219258
- Numerator of Sum_{k=1..n} 1/(k(k+1)(k+2)(k+3)) = Sum_{k=1..n} 1/Pochhammer(k,4).at n=34A230339
- Number of length n+3 0..4 arrays with some pair in every consecutive four terms totalling exactly 4.at n=2A245946