1487
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 20
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 1488
- 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
- 1486
- Möbius Function
- -1
- Radical
- 1487
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 96
- 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
- yes
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- yes
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 236
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Primes that divide at least one term in every Fibonacci sequence.at n=48A000057
- Primes p == 7, 19, 23 (mod 40) such that (p-1)/2 is also prime.at n=14A000353
- Related to population of numbers of form x^2 + y^2.at n=12A000694
- Primes with 5 as smallest primitive root.at n=33A001124
- Lesser of twin primes.at n=49A001359
- Smallest prime == 7 (mod 8) where Q(sqrt(-p)) has class number 2n+1.at n=18A002146
- Class 4- primes (for definition see A005109).at n=35A005112
- Safe primes p: (p-1)/2 is also prime.at n=32A005385
- Numbers k such that k-6, k, and k+6 are primes.at n=38A006489
- Where the prime race among 7k+1, ..., 7k+6 changes leader.at n=13A007354
- Prime triples: p; p+2 or p+4; p+6 all prime.at n=40A007529
- Primes of the form 2*k^2 + 29.at n=27A007641
- Coordination sequence T2 for Zeolite Code EPI.at n=24A008091
- Coordination sequence T2 for Banalsite.at n=23A008250
- If x and y are terms, so is x*y + 9.at n=15A009350
- Coordination sequence T3 for Zeolite Code ZON.at n=27A009921
- Coefficients in expansion of e as Sum_{n>=1} a(n)/(n*n!*(n+1)!), as found by greedy algorithm.at n=43A011189
- Number of partitions of n in its prime divisors with at least one part of size 1.at n=59A014652
- Nine iterations of Reverse and Add are needed to reach a palindrome.at n=1A015990
- Initial members of prime triples (p, p+2, p+6).at n=20A022004