1207
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 10
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 1296
- Proper Divisor Sum (Aliquot Sum)
- 89
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 1120
- Möbius Function
- 1
- Radical
- 1207
- 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
- 70
- 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
- no
- Odd
- yes
Appears in sequences
- Numbers k such that phi(2k+1) < phi(2k).at n=14A001837
- Number of partitions of n into parts 5k+2 or 5k+3.at n=56A003106
- Odd numbers not of form p + 2^k (de Polignac numbers).at n=21A006285
- Coordination sequence T2 for Zeolite Code APD.at n=23A008035
- Coordination sequence T1 for Scapolite.at n=22A008262
- Composite but smallest prime factor >= 17.at n=37A008367
- Coordination sequence for 6-dimensional lonsdaleite.at n=5A008526
- Coordination sequence T2 for Zeolite Code -WEN.at n=25A009863
- Numbers k such that sigma(k) = sigma(k+12).at n=15A015882
- Expansion of 1/(1-x^3-x^4-x^5-x^6-x^7-x^8).at n=24A017821
- Number of elements in the set {(x,y): 1 <= x,y <= n, gcd(x,y)=1}.at n=43A018805
- Numbers whose sum of divisors is a fourth power.at n=11A019422
- Fibonacci sequence beginning 8, 17.at n=10A022390
- a(n) = a(n-1) + c(n) for n >= 3, a( ) increasing, given a(1)=1 a(2)=3; where c( ) is complement of a( ).at n=43A022947
- a(n) = a(n-1) + c(n) for n >= 3, a( ) increasing, given a(1)=2, a(2)=3; where c( ) is complement of a( ).at n=43A022951
- Convolution of A023532 and primes.at n=29A023606
- a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, starting 1,0,1,1.at n=11A025273
- Triangle read by rows: square of the lower triangular mean matrix.at n=51A027446
- Numbers k such that A030747(k)=4.at n=43A030756
- Numbers having period-2 4-digitized sequences.at n=28A031184