15026
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 24624
- Proper Divisor Sum (Aliquot Sum)
- 9598
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 6820
- Möbius Function
- -1
- Radical
- 15026
- Omega Function (Ω)
- 3
- 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
- 89
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- 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
- Composite n such that phi(n) * sigma(n) is one less than a square.at n=38A015709
- Composite and even n such that phi(n) * sigma(n) is one less than a square.at n=22A015721
- Convolution of Lucas numbers and odd numbers.at n=14A023620
- McKay-Thompson series of class 39C for Monster.at n=48A058661
- Let b(1)=b(2)=1, b(k) = (2^b(k-1)+2^b(k-2)) (mod k); sequence gives values of n such that b(n)=0.at n=34A074782
- Numbers k such that sigma(sigma(k) - k) = phi(sigma(k) + k).at n=14A074886
- McKay-Thompson series of class 39C for the Monster group with a(0) = 1.at n=48A094362
- Partial sums of A011757.at n=18A109770
- One fifth of the sum of the first n primes, when an integer.at n=27A112271
- Rectangular array read by antidiagonals: a(n, d) is the smallest number that starts an arithmetic progression with common difference d of n numbers with the same number of divisors.at n=23A113465
- The number of unigraphical partitions of 2m; that is, the number of partitions of 2m which are realizable as the degree sequence of one and only one graph (where loops are not allowed but multiple edges are allowed).at n=34A143981
- 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, 0, 0), (0, -1, 1), (0, 1, -1), (1, -1, 1), (1, 1, 0)}.at n=8A149457
- Integers n such that 17+30*n are terms in A172456.at n=14A175103
- a(n) = n^3 - 4*n^2 + 6*n - 2.at n=23A188377
- Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w^2>x^2+y^2.at n=31A211810
- Number of (w,x,y,z) with all terms in {1,...,n} and 2|w-x|=|x-y|+|y-z|.at n=28A212575
- Number of (n+2)X(4+2) 0..4 arrays with every consecutive three elements in every row and diagonal having exactly two distinct values, and in every column and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=8A252957
- Composite numbers k such that phi(k) * psi(k) + 1 is a perfect square, where phi is the Euler totient function (A000010) and psi is the Dedekind psi function (A001615).at n=31A309653
- Number of distinct integer partitions whose parts can be combined together using additions and multiplications to obtain n, with the exception that 1's can only be added and not multiplied with other parts.at n=27A319913
- Two-Catalan Triangle read by rows, for n>=0 and k>=0.at n=38A380912