8839
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 28
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 8840
- Proper Divisor Sum (Aliquot Sum)
- 1
- 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
- 8838
- Möbius Function
- -1
- Radical
- 8839
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- 78
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- yes
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 1102
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 93.at n=17A031591
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 68 ones.at n=5A031836
- Numbers whose set of base-9 digits is {1,3}.at n=38A032916
- Numbers having four 1's in base 9.at n=27A043460
- Primes whose sum of digits is the perfect number 28.at n=19A048517
- Primes of the form k^2 + 3.at n=17A049423
- Numbers k such that 60^k - 59^k is prime.at n=1A062626
- Lesser of two consecutive primes such that p + n*q is a perfect square, p < q.at n=44A064543
- Primes which can be expressed as a sum of distinct powers of 3.at n=43A077717
- Prime numbers using only the curved digits 0, 3, 6, 8 and 9.at n=44A079652
- Primes p such that A001414(p-1) and A001414(p+1) are both prime, where A001414 = sum of primes dividing n (with repetition).at n=42A086715
- Numbers n such that A003313(n) = A003313(2n).at n=36A086878
- Primes p such that both the digit sum of p plus p and the digit product of p plus p are also primes.at n=33A092529
- Let (A,B)=(a(2*n),a(2*n+1)), then (A,B) is (even,odd), gcd(A,B)=1 and A^2 + B^2 = 5^n. Note: a(0)=0.at n=27A098122
- Primes of the form 47*k + 3.at n=24A100494
- Number of polyominoes consisting of 6 regular unit n-gons.at n=16A103472
- Primes such that the sum of the predecessor and successor primes is divisible by 37.at n=26A113156
- Column 0 of triangle A118438.at n=13A118439
- Duplicate of A049423.at n=17A121825
- Smallest prime divisor of 4n^2+3 that is of the form 6k+1.at n=46A125257