6725
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
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 8370
- Proper Divisor Sum (Aliquot Sum)
- 1645
- 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
- 5360
- Möbius Function
- 0
- Radical
- 1345
- 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
- 44
- 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 partitions into non-integral powers.at n=33A000327
- Strong pseudoprimes to base 82.at n=17A020308
- Positive numbers having the same set of digits in base 4 and base 9.at n=33A037427
- Numerators of continued fraction convergents to sqrt(581).at n=7A042112
- a(n) = A033001(n)/4.at n=35A043307
- Rhombi (in 3 different orientations) in a rhombus with 60-degree acute angles.at n=24A052153
- a(n) = 4*n^2 + 1.at n=41A053755
- a(n) = 4*prime(n)^2+1.at n=12A060429
- Numbers m such that [A070080(m), A070081(m), A070082(m)] is an acute scalene integer triangle with prime side lengths.at n=16A070123
- Numbers n such that n and n+2 are of the form p^2*q where p and q are distinct primes.at n=23A074173
- a(n) = floor((1+sqrt(2))^n).at n=10A080039
- Number of planar partitions of n with exactly 2 rows.at n=18A091356
- Main diagonal of triangle A100226.at n=10A100227
- Number of distinct products i*j*k for 1 <= i <= j < k <= n.at n=48A100435
- Sum of n-th prime squared and n-th perfect square.at n=21A106587
- a(n) = 8*n^2 - 3.at n=28A108928
- One fifth of the sum of the first n primes, when an integer.at n=20A112271
- Limit set for operation of repeatedly replacing a number with the sum of the 4th power of its digits.at n=9A113708
- Composite number of the form 4n^2+1.at n=25A121944
- a(n) = n_{n^2}.at n=40A122625