15214
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 22824
- Proper Divisor Sum (Aliquot Sum)
- 7610
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7606
- Möbius Function
- 1
- Radical
- 15214
- Omega Function (Ω)
- 2
- 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
- 84
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 78 ones.at n=12A031846
- Semiprimes (A001358) whose digit reversal is a pentagonal number (A000326).at n=24A115708
- Eight bishops and one elephant on a 3 X 3 chessboard: a(n) = 2*Pell(n+1)+2*Pell(n)-2^n, with Pell = A000129.at n=10A175658
- a(n) is the number of Fibonacci meanders of length m*n and central angle 360/m degrees where m = 2.at n=11A201631
- 2^(n-1) - floor((2^(n-1) - 1)/(n-1)).at n=13A213255
- Partial sums of A255283.at n=45A255428
- Number of 5Xn arrays containing n copies of 0..5-1 with every element equal to or 1 greater than any north, southwest or northwest neighbors modulo 5 and the upper left element equal to 0.at n=11A267203
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 422", based on the 5-celled von Neumann neighborhood.at n=43A272087
- Composite numbers k such that phi(x) = psi(k)*phi(k) has no solution.at n=7A292714
- Number of partitions of n with seven parts in which no part occurs more than twice.at n=43A320595
- Number of integer partitions of n with integer alternating product.at n=43A347446
- Triangle of generalized Stirling numbers of the lower level of the hierarchy (section m=1).at n=23A376863