5075
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 17
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 7440
- Proper Divisor Sum (Aliquot Sum)
- 2365
- 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
- 3360
- Möbius Function
- 0
- Radical
- 1015
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
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
- 134
- 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
- a(n) = 3^n reduced modulo 2^n.at n=13A002380
- Number of unlabeled minimally 2-connected graphs with n nodes (also called "blocks").at n=11A003317
- Coordination sequence T2 for Zeolite Code YUG.at n=46A008248
- Coordination sequence T2 for Zeolite Code CZP.at n=46A019457
- Expansion of 1/((1-5*x)*(1-6*x)*(1-12*x)).at n=3A019869
- Numbers with exactly 6 2's in their ternary expansion.at n=33A023704
- High temperature series for spin-1/2 Ising partition function on 5D simple cubic lattice.at n=4A030048
- Triangle of B-analogs of Stirling numbers of the second kind.at n=32A039755
- Triangle of B-analogs of Stirling numbers of 2nd kind.at n=31A039756
- Numerators of continued fraction convergents to sqrt(393).at n=8A041746
- Numbers whose base-5 representation contains exactly three 0's and two 3's.at n=12A045201
- a(n) = a(n-2) + a(n-3), with a(0) = 3, a(1) = 2, a(2) = 6.at n=27A046877
- a(n) = (n+1)*(2^(n+1) - n)/2.at n=9A048470
- Second pentagonal numbers with even index: a(n) = n*(6*n+1).at n=29A049453
- Number of nonempty subsequences {s(k)} of 1..n such that the difference sequence is palindromic.at n=18A053599
- Sum of the first n Sophie Germain primes.at n=25A066819
- Numbers k such that sigma(k+1) = 4*phi(k).at n=45A067262
- Composite numbers k with no prime factor among (2, 3) (cf. A038509) and such that phi(k) < 2*k/3.at n=18A069043
- Smallest k > 0 with gcd(k, rev(k)) = n, where rev(k) is digit reversal of k, or 0 if no such k exists.at n=34A069554
- a(n) = smallest non-palindromic number k such that k and its digit reversal are divisible by n, or 0 if n is a multiple of 10.at n=34A069555