2075
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 2604
- Proper Divisor Sum (Aliquot Sum)
- 529
- 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
- 1640
- Möbius Function
- 0
- Radical
- 415
- 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
- 94
- 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 connected graphs with n nodes, n+2 edges.at n=8A001436
- a(n) = Sum_{t=0..n} g(t)*g(n-t) where g(t) = A002121(t).at n=38A002122
- Numbers of the form (p^2 - 1)/120 where p is 1 or prime.at n=45A002381
- Representation degeneracies for boson strings.at n=33A005290
- Number of 3rd-order maximal independent sets in cycle graph.at n=35A007387
- Coordination sequence T2 for Zeolite Code DOH.at n=28A008079
- Coordination sequence T3 for Zeolite Code GOO.at n=31A008113
- Number of partitions of n into parts >= 3.at n=41A008483
- Number of increasing sequences of Goldbach type with maximal element n.at n=14A008929
- Obsolete sequence of lower bounds for A028444.at n=5A016072
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly five 1's.at n=18A020441
- Expansion of Product_{m>=1} (1 + m*q^m)^5.at n=6A022633
- a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = A014306, t = (primes).at n=40A024696
- a(n) = sum of the numbers between the two n's in A026358.at n=23A026361
- Number of partitions of n in which the least part is 3.at n=44A026796
- a(n) = Sum_{0<=i<=i<=n} A027082(i, n+j).at n=7A027099
- a(n) = n^2 + n + 5.at n=45A027690
- Number of partitions of n with equal number of parts congruent to each of 0, 2 and 3 (mod 5).at n=43A035575
- Number of partitions of n into parts 4k+2 and 4k+3 with at least one part of each type.at n=53A035626
- Number of partitions in parts not of the form 21k, 21k+3 or 21k-3. Also number of partitions with at most 2 parts of size 1 and differences between parts at distance 9 are greater than 1.at n=28A035981