3415
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4104
- Proper Divisor Sum (Aliquot Sum)
- 689
- 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
- 2728
- Möbius Function
- 1
- Radical
- 3415
- 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
- 149
- 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
- Divisors of 2^44 - 1.at n=19A003549
- a(n) = Sum_{k=1..n} k*phi(k).at n=24A011755
- Numbers n such that phi(n) * sigma(n) + 4 is a perfect square.at n=41A015727
- Numbers k such that the continued fraction for sqrt(k) has period 40.at n=24A020379
- Base 6 expansion uses each positive digit just once.at n=33A023744
- Convolution of Thue-Morse sequence A001285 with primes.at n=34A029888
- 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 11.at n=30A031509
- Number of connected functions on n points with a loop of length 11.at n=6A032207
- Coordination sequence T3 for Zeolite Code SBE.at n=47A033606
- Coordination sequence T4 for Zeolite Code SBE.at n=47A033607
- Coordination sequence for Zeolite Code DFT.at n=40A038408
- Base-4 palindromes that start with 3.at n=31A043005
- Numbers whose base-15 representation has exactly 4 runs.at n=23A043671
- Numbers n such that string 1,5 occurs in the base 10 representation of n but not of n-1.at n=38A044347
- Numbers n such that string 1,5 occurs in the base 10 representation of n but not of n+1.at n=38A044728
- Numbers whose base-4 representation contains exactly four 1's and two 3's.at n=10A045131
- T(n,n+1), array T as in A047150.at n=7A047156
- Numbers k such that 2^k - k is prime.at n=8A048744
- Numbers n such that n | 9^n + 8^n + 7^n + 6^n + 5^n.at n=16A057253
- a(n) = a(n-1) + the number of primes <= a(n-1).at n=32A061535