4885
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 5868
- Proper Divisor Sum (Aliquot Sum)
- 983
- 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
- 3904
- Möbius Function
- 1
- Radical
- 4885
- 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
- 41
- 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
- Generalized Fibonacci numbers.at n=7A006604
- Coordination sequence T1 for Zeolite Code RUT.at n=46A009897
- Numbers k such that the continued fraction for sqrt(k) has period 45.at n=13A020384
- Convolution of Lucas numbers and A014306.at n=16A023624
- a(n) = T(2n-1,n-2), T given by A026747.at n=5A026752
- Number of partitions of n with equal number of parts congruent to each of 2 and 3 (mod 5).at n=39A035559
- Denominators of continued fraction convergents to sqrt(850).at n=4A042641
- Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 13.at n=14A051978
- Sum of a(n) terms of 1/k^(3/4) first exceeds n.at n=30A056179
- Numbers k such that the smoothly undulating palindromic number (17*10^k - 71)/99 is a prime.at n=2A062213
- Dimension of the space of weight n cuspidal newforms for Gamma_1( 88 ).at n=37A063361
- Numbers k such that there are exactly 8 numbers j for which binomial(k, floor(k/2)) / binomial(k,j) is an integer, i.e., A080383(k) = 8.at n=34A080386
- a(n) = smallest m >= 1 such that Sum_{k=1..m} log(k)/k >= n.at n=36A092753
- Values of r such that N(r)/r^2 > Pi, where N(r) is the number of integer lattice points (x,y) inside or on a circle of radius r.at n=33A093832
- Numbers n such that 9*10^n + 8*R_n - 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=12A103109
- Numbers k such that f(k), f(k+1) and f(k+2) are all primes, where f(k) = 8*k^2 + 4*k + 1.at n=27A103777
- a(1) = 932; for n > 1, a(n) = a(n-1) + 1 + sum of distinct prime factors of a(n-1) that are < a(n-1).at n=17A105213
- A sequence related to M-partitions.at n=52A117115
- Numbers with composite sum of digits and prime sum of cubes of digits.at n=16A121642
- a(n) = ((3 + 2*sqrt(2))*(3 + sqrt(2))^n + (3 - 2*sqrt(2))*(3 - sqrt(2))^n)/2.at n=5A163606