4525
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
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 5642
- Proper Divisor Sum (Aliquot Sum)
- 1117
- 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
- 3600
- Möbius Function
- 0
- Radical
- 905
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 38
- 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
- Discriminants of totally real quartic fields (see comments).at n=14A002769
- a(n) = C(n,1) + C(n,2) + C(n,3), or n*(n^2 + 5)/6.at n=30A004006
- Pseudoprimes to base 7.at n=12A005938
- Pseudoprimes to base 26.at n=31A020154
- Strong pseudoprimes to base 7.at n=5A020233
- Strong pseudoprimes to base 49.at n=7A020275
- Discriminants of totally real quartic fields.at n=17A023680
- Every suffix prime and no 0 digits in base 6 (written in base 6).at n=39A024781
- Numbers whose set of base-11 digits is {3,4}.at n=21A032835
- Number of partitions of n such that cn(0,5) = cn(2,5) <= cn(1,5) < cn(3,5) = cn(4,5).at n=69A036851
- Number of partitions satisfying cn(0,5) <= cn(1,5) + cn(4,5) + cn(2,5) + cn(3,5).at n=28A039849
- Odd numbers with only palindromic prime factors whose sum is palindromic (counted with multiplicity).at n=19A046356
- Numbers of the form p*q*r where p,q,r are (not necessarily distinct) odd palindromic primes (odd terms from A002385).at n=45A046373
- Coordination sequence T3 for Zeolite Code AEN.at n=42A047952
- Number of factorizations with one level of parentheses indexed by prime signatures. A050336(A025487).at n=49A050337
- 17-gonal (or heptadecagonal) numbers: a(n) = n*(15*n-13)/2.at n=25A051869
- Let Py(n)=A000330(n)=n-th square pyramidal number. Consider all integer triples (i,j,k), j >= k>0, with Py(i)=Py(j)+Py(k), ordered by increasing i; sequence gives k values.at n=33A053721
- Second spoke of a hexagonal spiral.at n=39A056106
- McKay-Thompson series of class 10a for Monster.at n=8A058102
- a(n) = least odd number which can be represented in the form p + 2*k^2, k>0, in n different ways.at n=32A060004