2986
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 4482
- Proper Divisor Sum (Aliquot Sum)
- 1496
- 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
- 1492
- Möbius Function
- 1
- Radical
- 2986
- 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
- 22
- 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
- Number of partitions of n into nonprime parts.at n=48A002095
- a(n) = ceiling(n*phi^11), where phi is the golden ratio, A001622.at n=15A004966
- Coordination sequence T3 for Zeolite Code AEL.at n=36A008006
- Coordination sequence T1 for Zeolite Code AFS.at n=42A008023
- Coordination sequence T3 for Zeolite Code -ROG.at n=41A009861
- Numbers that are not the sum of a square and a prime.at n=44A014090
- Numbers k such that the continued fraction for sqrt(k) has period 11.at n=29A020350
- Neither square nor square + prime.at n=17A020495
- Index of 5^n within sequence of numbers of form 2^i * 5^j.at n=50A022334
- Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 3.at n=41A031416
- Decimal part of cube root of a(n) starts with 4: first term of runs.at n=13A034130
- Numbers k such that the string 7,7 occurs in the base 9 representation of k but not of k-1.at n=36A044321
- Numbers n such that string 8,6 occurs in the base 10 representation of n but not of n-1.at n=32A044418
- Numbers n such that string 7,7 occurs in the base 9 representation of n but not of n+1.at n=36A044702
- Numbers n such that string 8,6 occurs in the base 10 representation of n but not of n+1.at n=32A044799
- a(1) = 1; a(n) = sum of terms in the continued fraction for the square of the continued fraction [a(1); a(2), a(3), a(4),..., a(n-1)].at n=34A061143
- a(n) = a(n-1) + the number of primes <= a(n-1).at n=31A061535
- Triangle defined in A064641 read by rows.at n=32A064642
- Numbers k such that prime(k+1)-(k+1)*tau(k+1) = prime(k)-k*tau(k) where tau(k) = A000005(k) is the number of divisors of k.at n=42A067293
- Smaller terms in the pairs of numbers (a < b) in the sequence {a,b}-> {Max[{a,b}]-Min[{a,b}],k*Min[{a,b}]} with k=3 and the first pair {a=1,b=2}. See A075256.at n=37A075257