15435
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 24
- Divisor Sum
- 31200
- Proper Divisor Sum (Aliquot Sum)
- 15765
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7056
- Möbius Function
- 0
- Radical
- 105
- Omega Function (Ω)
- 6
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 53
- 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
- Odd abundant numbers (odd numbers m whose sum of divisors exceeds 2m).at n=33A005231
- a(n) = (2*n - 7)*n^2.at n=21A015242
- Numerator of sum of -3rd powers of divisors of n.at n=37A017669
- Triangle of numerators of coefficients, where the n-th row forms the polynomial in z, P(n,z), that is the coefficient of x^n in {-log(1-x)/x}^z, for n > 0. The denominator for all the terms in the n-th row is A053657(n).at n=18A075264
- Odd primitive numbers such that n! divided by product of factorials of all proper divisors of n is not an integer.at n=20A075460
- Least m such that P - m is prime, where P is the n-th perfect number.at n=23A078097
- Triangle, read by rows, of coefficients for the third iteration of the hyperbinomial transform.at n=23A089463
- Number of (s(0), s(1), ..., s(n)) such that 0 < s(i) < 6 and |s(i) - s(i-1)| <= 1 for i = 1,2,...,n, s(0) = 1, s(n) = 1.at n=12A094286
- Triangle of coefficients of square of Hermite polynomials divided by 2^n with argument sqrt(x/2).at n=31A111595
- Fourth column (m=3) of unsigned triangle A111595.at n=4A111777
- Triangle T(n,k), n >= 0, 0 <= k <= n, read by rows: T(n,k) is the number of forests of trees on n or fewer nodes using a subset of labels 1..n and k edges.at n=32A144258
- "Trim" numbers that are not prime; see reference for definition.at n=37A145555
- Numbers with exactly 3 distinct odd prime divisors {3,5,7}.at n=18A147576
- 7 times heptagonal numbers: a(n) = 7*n*(5*n-3)/2.at n=30A152777
- Totally multiplicative sequence with a(p) = 7p for prime p.at n=44A166628
- Odd almost practical numbers.at n=29A174535
- Odd abundant numbers whose abundance is even.at n=32A174865
- Triangle of divisors of 105^n, each number occurring once.at n=50A194360
- a(n) = 7*( ((3 + sqrt(5))/2)^n + ((3 - sqrt(5))/2)^n - 2 ).at n=7A206723
- Number of (n+1) X 2 0..3 arrays with every 2 X 2 subblock having one, two or four distinct values, and new values 0..3 introduced in row major order.at n=4A210054