2918
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4380
- Proper Divisor Sum (Aliquot Sum)
- 1462
- 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
- 1458
- Möbius Function
- 1
- Radical
- 2918
- 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
- 35
- 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
- yes
- Odd
- no
Appears in sequences
- Numbers that are the sum of 6 positive 6th powers.at n=22A003362
- Powers of 2 written backwards.at n=13A004094
- Number of points on surface of octahedron; also coordination sequence for cubic lattice: a(0) = 1; for n > 0, a(n) = 4n^2 + 2.at n=27A005899
- If a, b in sequence, so is ab+10.at n=20A009368
- a(0) = 1, a(n) = 9*n^2 + 2 for n>0.at n=18A010002
- Number of partitions of n into distinct parts, none being 5.at n=52A015750
- 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 54.at n=0A031552
- Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 54.at n=1A031732
- Powers of 2 written backwards and sorted.at n=10A034906
- Number of ways to break {1,2,3,...,n} into sets with equal sums.at n=14A035470
- Base 6 digits are, in order, the first n terms of the periodic sequence with initial period 2,1,3,0.at n=4A037739
- Coordination sequence T3 for Zeolite Code STF.at n=36A038442
- Number of partitions of n into a prime number of parts.at n=32A038499
- Concatenate n-th prime and n-th composite.at n=9A038530
- Numbers n such that string 0,2 occurs in the base 9 representation of n but not of n-1.at n=38A044253
- Numbers n such that string 1,8 occurs in the base 10 representation of n but not of n-1.at n=32A044350
- Numbers n such that string 0,2 occurs in the base 9 representation of n but not of n+1.at n=38A044634
- Numbers n such that string 1,8 occurs in the base 10 representation of n but not of n+1.at n=32A044731
- Number of mobiles (circular rooted trees) with n nodes and 4 leaves.at n=9A055342
- Even integers that are not partial sums of A062547.at n=32A062548