6877
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
- 6
- Divisor Sum
- 7742
- Proper Divisor Sum (Aliquot Sum)
- 865
- 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
- 6072
- Möbius Function
- 0
- Radical
- 299
- Omega Function (Ω)
- 3
- 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
- 150
- 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
- no
- Odd
- yes
Appears in sequences
- Number of Twopins positions.at n=23A005691
- Number of connected n-state finite automata with 3 inputs.at n=1A006692
- a(n) = n OR n^3 (applied to ternary expansions).at n=18A008469
- a(0) = 1, a(n) = 11*n^2 + 2 for n>0.at n=25A010003
- Numbers k such that the continued fraction for sqrt(k) has period 60.at n=30A020399
- a(n) = (d(n)-r(n))/2, where d = A026037 and r is the periodic sequence with fundamental period (1,0,0,1).at n=32A026038
- Number of (s,3) gates.at n=5A037295
- Number of (s,6) gates.at n=2A037298
- Denominators of continued fraction convergents to sqrt(779).at n=6A042503
- Number of partitions of n into Lucas parts (A000032).at n=52A067593
- Numbers k such that phi(k) mod core(k) = 1 where core(k) is the squarefree part of k.at n=45A069946
- Numbers k such that (10^k + 2)/6 is prime.at n=24A076850
- Numbers k such that 7*(10^k - 1)/9 - 3*10^floor(k/2) is a palindromic wing prime (also known as near-repdigit palindromic prime).at n=8A077781
- Number of parts in all compositions of n into distinct parts.at n=19A097910
- Maximum sum of products of successive pairs in a permutation of order n+1.at n=26A101986
- Numbers k such that the k-th semiprime == 11 (mod k).at n=6A106136
- Beginning with 3, least number such that concatenation of first n terms and its digit reversal both are primes.at n=35A111382
- Odd interprimes divisible by 13.at n=29A124619
- Triangle of the numerators of the almost-harmonic numbers: n-th term in m-th row is numerator of (sum{k=1 to m} 1/k) - 1/n, 1<=n<=m.at n=49A125900
- a(n) = least k such that the remainder when 15^k is divided by k is n.at n=27A128155