7387
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 25
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 7560
- Proper Divisor Sum (Aliquot Sum)
- 173
- 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
- 7216
- Möbius Function
- 1
- Radical
- 7387
- 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
- Products of 2 successive primes.at n=22A006094
- 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 85.at n=13A031583
- Concatenation of n-th prime number and n-th lucky number.at n=20A032603
- Squares of primes or products of pairs of consecutive primes.at n=45A033476
- Numbers whose maximal base-9 run length is 4.at n=15A037999
- Numbers having four 1's in base 9.at n=10A043460
- Numbers whose base-3 representation has exactly 9 runs.at n=3A043589
- Numbers n such that number of runs in the base 3 representation of n is congruent to 1 mod 8.at n=19A043799
- Numbers n such that number of runs in the base 3 representation of n is congruent to 0 mod 9.at n=3A043806
- Numbers k such that number of runs in the base 3 representation of k is congruent to 9 mod 10.at n=3A043824
- Number of partitions of n with equal number of parts congruent to each of 0, 1, 2 and 3 (mod 4).at n=70A046770
- Number of partitions of n with equal nonzero number of parts congruent to each of 0, 1, 2 and 3 (mod 4).at n=70A046782
- a(1)=2, a(n+1) is the smallest integer > a(n) such that the smallest prime factor of a(n+1) is the largest prime factor of a(n).at n=46A057602
- Composite and every divisor (except 1) contains the digit 8.at n=1A062678
- a(n) is the coefficient of x^n in x/(1 + Sum_{k>=1} (1/2)*(prime(k+1) - 1)*x^k).at n=43A074142
- Numbers n such that the sum of composites from the smallest prime factor of n to the largest prime factor of n is equal to the sum of squarefree numbers from the smallest prime factor of n to the largest prime factor of n.at n=4A074255
- a(n) = prime(2*n-1)*prime(2*n).at n=11A089581
- Numbers that are products of (at least two) consecutive primes.at n=32A097889
- Integer part of n#/(p-7)#, where p=preceding prime to n.at n=20A102792
- Product of the n-th sexy prime pair.at n=14A111192