1427
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 2
- Divisor Sum
- 1428
- 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
- 1426
- Möbius Function
- -1
- Radical
- 1427
- 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
- 26
- 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
- no
- Powerful Number
- no
- Achilles Number
- no
- Prime Index
- 225
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Lesser of twin primes.at n=46A001359
- Mixed partitions of n.at n=23A002096
- Divisible only by primes congruent to 6 mod 7.at n=41A004624
- Class 4- primes (for definition see A005109).at n=34A005112
- Number of compositions (ordered partitions) of n into squares.at n=23A006456
- Prime triples: p; p+2 or p+4; p+6 all prime.at n=36A007529
- Coordination sequence T1 for Zeolite Code JBW.at n=25A008121
- Coordination sequence T8 for Zeolite Code MFI.at n=24A008171
- Coordination sequence T1 for Zeolite Code ATO.at n=25A008265
- a(n) = prime(n^2).at n=14A011757
- Primes with primitive root 8.at n=51A019338
- Numbers k such that the continued fraction for sqrt(k) has period 22.at n=29A020361
- Initial members of prime triples (p, p+2, p+6).at n=18A022004
- n-th prime p(k) such that p(k) + p(k+6) = p(k+2) + p(k+4).at n=27A022891
- Primes that remain prime through 2 iterations of function f(x) = x + 6.at n=36A023241
- Primes that remain prime through 2 iterations of function f(x) = 2x + 3.at n=28A023242
- Primes that remain prime through 2 iterations of function f(x) = 4x + 9.at n=30A023251
- Primes that remain prime through 3 iterations of function f(x) = 2x + 3.at n=12A023273
- Primes that remain prime through 4 iterations of function f(x) = 2x + 3.at n=5A023303
- Primes that remain prime through 5 iterations of function f(x) = 2x + 3.at n=2A023331