12103
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 7
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 15960
- Proper Divisor Sum (Aliquot Sum)
- 3857
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 9072
- Möbius Function
- 0
- Radical
- 1729
- 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
- 187
- 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
- Numbers k such that 39*2^k + 1 is prime.at n=37A002269
- Number of n-bead bracelets (turnover necklaces) of two colors with 6 red beads and n-6 black beads.at n=25A005513
- dot product (n,n-1,...2,1).(3,4,...,n,1,2).at n=36A026054
- a(n) = (d(n)-r(n))/2, where d = A026057 and r is the periodic sequence with fundamental period (0,0,1,0).at n=45A026058
- Positive numbers having the same set of digits in base 6 and base 10.at n=33A037437
- Gaps of 6 in sequence A038593 (upper terms).at n=4A038652
- Numbers ending with '3' that are the difference of two positive cubes.at n=26A038858
- Numbers k such that k | 5^k + 4^k + 3^k + 2^k.at n=17A057249
- Number of 4-block ordered tricoverings of an unlabeled n-set.at n=37A060488
- Integer part of log(n^n)^(1 + log(log(1 + n))).at n=23A062479
- Multiples of 7 whose sum of digits is equal to 7.at n=26A063416
- Numbers k such that 2^k - k^2 is prime.at n=25A072180
- 4-Smith numbers.at n=10A103125
- Multiples of 1729, the Hardy-Ramanujan number.at n=7A138129
- Numbers n such that primorial(n)/2 - 128 is prime.at n=15A139450
- Numbers k such that k, k + 1 and k + 2 are 3 consecutive Harshad numbers.at n=31A154701
- Numbers n whose square can be represented as a repdigit number in some base less than n.at n=43A158235
- Friedman numbers n such that n+1 is also a Friedman number.at n=18A195420
- Smallest m such that m can be written in exactly n ways as x^2 + xy + y^2 with 0 <= x <= y.at n=6A198799
- v(n+1)/v(n), where v=A203673.at n=1A203674