7907
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 23
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 7908
- Proper Divisor Sum (Aliquot Sum)
- 1
- 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
- 7906
- Möbius Function
- -1
- Radical
- 7907
- Omega Function (Ω)
- 1
- Little Omega Function (ω)
- 1
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
- 52
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- yes
- Composite Number
- no
- Semiprime
- no
- Squarefree Number
- yes
- Prime Power
- yes
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 999
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Numbers k such that the continued fraction for sqrt(k) has period 70.at n=24A020409
- Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 87.at n=32A031585
- Number of symmetric n X 3 crossword puzzle grids.at n=10A034185
- Discriminants of imaginary quadratic fields with class number 21 (negated).at n=20A046018
- First term of strong prime quintets: p(m+1)-p(m) > p(m+2)-p(m+1) > p(m+3)-p(m+2) > p(m+4)-p(m+3).at n=22A054808
- Primes of the form 4*k^2 + 163.at n=37A057604
- McKay-Thompson series of class 28A for Monster.at n=29A058606
- Primes p such that x^59 = 2 has no solution mod p.at n=18A059312
- Primes p such that x^67 = 2 has no solution mod p.at n=17A059330
- Primes p such that p^8 reversed is also prime.at n=42A059701
- Primes starting and ending with 7.at n=32A062334
- Primes p such that p^6 + p^3 + 1 is prime.at n=43A066100
- First column of square array A082011.at n=43A082013
- Balanced primes of order three.at n=44A082078
- Balanced primes of order four.at n=8A082079
- Balanced primes (A090403) of index 2.at n=39A096706
- Numbers k such that 4*k! - 1 is prime.at n=19A099350
- Primes in A103375.at n=16A103385
- Prime numbers q such that q^2 = 2*prime(n) + n for some n.at n=39A104852
- Lesser prime in pair prime(k) +/- k for some k.at n=19A107636