4426
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
- 4
- Divisor Sum
- 6642
- Proper Divisor Sum (Aliquot Sum)
- 2216
- 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
- 2212
- Möbius Function
- 1
- Radical
- 4426
- 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
- 139
- 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
- Coordination sequence T4 for Zeolite Code TON.at n=41A008244
- Coordination sequence T2 for Coesite.at n=35A008268
- If a, b in sequence, so is ab+6.at n=41A009307
- Numbers k such that the continued fraction for sqrt(k) has period 59.at n=4A020398
- Number of distinct prime signatures of the positive integers up to 2^n.at n=40A025488
- Sequence satisfies T(a)=a, where T is defined below.at n=46A027592
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 26 ones.at n=39A031794
- Number of partitions of n with equal nonzero number of parts congruent to each of 1 and 3 (mod 5).at n=42A035567
- Number of partitions of n into parts not of the form 23k, 23k+8 or 23k-8. Also number of partitions with at most 7 parts of size 1 and differences between parts at distance 10 are greater than 1.at n=29A035996
- Coordination sequence T4 for Zeolite Code DON.at n=45A047956
- Numbers k such that 153*2^k-1 is prime.at n=32A050618
- Numbers k such that 6*10^k+1 is prime.at n=23A056805
- Indices of primes in sequence defined by A(0) = 41, A(n) = 10*A(n-1) + 11 for n > 0.at n=7A101719
- Numbers n such that 6*10^n-7 is prime.at n=17A103025
- Semiprimes with even digits.at n=47A108636
- Sum of the even parts in all partitions of n into distinct parts.at n=30A116684
- Number of partitions of n into parts which are not digits of n in decimal representation.at n=44A136460
- a(n) = 2*n^2 + 8.at n=47A155966
- Partial sums of floor(3^n/10)/2.at n=9A178828
- E.g.f. satisfies: A(x) = exp(x) - exp(x*A(x)) + exp(x*A(x)^2).at n=5A195512