2626
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 4284
- Proper Divisor Sum (Aliquot Sum)
- 1658
- 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
- 1200
- Möbius Function
- -1
- Radical
- 2626
- Omega Function (Ω)
- 3
- 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
- 27
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- yes
- Odd
- no
Appears in sequences
- Cake numbers: maximal number of pieces resulting from n planar cuts through a cube (or cake): C(n+1,3) + n + 1.at n=25A000125
- 10-gonal (or decagonal) numbers: a(n) = n*(4*n-3).at n=26A001107
- Cubes written in base 7.at n=9A004637
- Coefficients of modular function G_2(tau).at n=48A005760
- Coordination sequence T3 for Zeolite Code MOR.at n=33A008184
- Coordination sequence T1 for Zeolite Code SGT.at n=32A008229
- Coordination sequence T3 for Zeolite Code RSN.at n=33A009887
- Coordination sequence T2 for Zeolite Code VSV.at n=33A009915
- Coordination sequence for MgZn2, Mg position.at n=13A009939
- Numbers k that divide 4^k + 4.at n=10A015889
- Numbers k such that k | 13^k + 13.at n=7A015905
- Pseudoprimes to base 79.at n=18A020207
- Pseudoprimes to base 87.at n=21A020215
- Doublets: base-10 representation is the juxtaposition of two identical strings.at n=25A020338
- Numbers k such that the continued fraction for sqrt(k) has period 19.at n=19A020358
- Least k such that A020951(k) = n.at n=41A020953
- Fibonacci sequence beginning 2, 17.at n=12A022118
- a(n) = n*(31*n + 1)/2.at n=13A022289
- Even 10-gonal (or decagonal) numbers.at n=13A028994
- a(n) = n * prime(n).at n=25A033286