7887
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 30
- Digital Root
- 3
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 11520
- Proper Divisor Sum (Aliquot Sum)
- 3633
- 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
- 4760
- Möbius Function
- -1
- Radical
- 7887
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 176
- 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
- no
- Odd
- yes
Appears in sequences
- Positive numbers having the same set of digits in base 8 and base 9.at n=31A037441
- Base-10 palindromes that start with 7.at n=20A043042
- Palindromes with exactly 3 distinct prime factors.at n=34A046393
- Distinct numbers in writing first numerator and then denominator of each element of the 1/5-Pascal triangle (by row).at n=46A046608
- First numerator and then denominator of the elements to the right of the central elements of the 1/5-Pascal triangle (by row), excluding 1's.at n=61A046615
- First numerator and then denominator of the elements to the right of the central elements of the 1/5-Pascal triangle (by row), excluding 1's and 5's.at n=36A046616
- First numerator and then denominator of the elements to the right of the central elements of the 1/5-Pascal triangle (by row), excluding 5's.at n=73A046617
- Numerators of the elements to the right of the central elements of the 1/5-Pascal triangle (by row).at n=49A046618
- First denominator and then numerator of each element to the right of the central elements of the 1/5-Pascal triangle (by row), excluding 5's.at n=73A046621
- Distinct odd numbers in the numerators of the 1/5-Pascal triangle (by row).at n=24A046624
- Distinct numbers in writing first numerator and then denominator of each element to the right of the central elements of the 1/5-Pascal triangle (by row).at n=38A046627
- Distinct odd numbers in writing first numerator and then denominator of each element to the right of the central elements of the 1/5-Pascal triangle (by row).at n=21A046628
- Numbers k such that 5*2^k + 7 is prime.at n=23A059748
- Seventh column of quintinomial coefficients.at n=9A064056
- n sets a new record for the number of integers k such that n = k + reverse(k).at n=26A067035
- Palindromic odd composite numbers that are the products of an odd number of distinct primes.at n=19A075808
- Palindromic odd numbers with exactly 3 prime factors (counted with multiplicity).at n=28A075814
- Palindromic odd composite numbers with an odd number of prime factors (counted with multiplicity).at n=30A075815
- Palindromes not divisible by any of their digits.at n=46A082947
- Palindromes neither divisible by any of their digits nor by the sum of their digits.at n=44A082948