14725
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 19840
- Proper Divisor Sum (Aliquot Sum)
- 5115
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 10800
- Möbius Function
- 0
- Radical
- 2945
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
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
- yes
- Narcissistic Number
- no
- Collatz Steps
- 133
- 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
- a(n) = n*(n + 1)*(n^2 - 3*n + 6)/8.at n=18A004255
- Number of partitions of n into parts of 5 kinds.at n=9A023004
- Indices of heptagonal numbers (A000566) which are also 9-gonal.at n=2A048920
- a(n) = floor(X/Y) where X = concatenation in decreasing order of (2n)-th even number to (n+1)-th even number and Y = that of first n even numbers in increasing order.at n=8A067092
- Sides of integer Heronian triangles [A068967(n), prime(A068967(n)), a(n)] with area A068969(n).at n=21A068968
- Pair the odd numbers such that the k-th pair is (r, r+2k) where r is the smallest odd number not included earlier: (1, 3), (5, 9), (7, 13), (11, 19), (15, 25), (17, 29), (21, 35), (23, 39), (27, 45), ... This is the sequence of the product of the members of pairs.at n=29A075320
- Diagonal in array of n-gonal numbers A081422.at n=24A081435
- a(n) = 10*a(n-1) - 17*a(n-2), a(0) = 1, a(1) = 5.at n=5A084131
- Duplicate of A004255.at n=19A101357
- Expansion of 1/(1-x*(1-3*x)).at n=19A106852
- Number of doubletons in all partitions of n. By a doubleton in a partition we mean an occurrence of a part exactly twice (the partition [4,(3,3),2,2,2,(1,1)] has two doubletons, shown between parentheses).at n=36A116646
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, 0), (-1, 1, 1), (0, 0, 1), (1, 0, -1)}.at n=10A148299
- Expansion of (1+147*x+1230*x^2+1915*x^3+744*x^4+66*x^5+x^6)/(1-x)^7.at n=3A160841
- Coefficient of x in the reduction of n-th polynomial at A157751 by x^2->x+2.at n=9A192339
- Number of (w,x,y,z) with all terms in {1,...,n} and w*x<=y*z+1.at n=13A212053
- Composite numbers n such that lambda(n) divides 5n-5, where lambda is the Carmichael lambda function (A002322).at n=40A231572
- Numbers k that divide sigma(k*(k+1)/2).at n=48A275374
- Number of 1-sided ouroboros polyominoes with k=2n cells.at n=11A359707
- Primitive terms of A389634.at n=30A389635