1412
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 8
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 2478
- Proper Divisor Sum (Aliquot Sum)
- 1066
- 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
- 704
- Möbius Function
- 0
- Radical
- 706
- Omega Function (Ω)
- 3
- 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
- 127
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- 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
- yes
- Odd
- no
Appears in sequences
- a(0) = a(1) = 1; thereafter a(n) = sigma(a(n-1)) + sigma(a(n-2)).at n=10A000458
- Conjecturally largest even integer which is an unordered sum of two primes in exactly n ways.at n=18A000954
- Numbers k such that k^4 can be written as a sum of four positive 4th powers.at n=5A003294
- Royal paths in a lattice (convolution of A006318).at n=6A006319
- Coordination sequence T2 for Zeolite Code ATV.at n=24A008044
- Expansion of e.g.f. arcsin(log(x+1) - tanh(x)).at n=7A013283
- Expansion of e.g.f. sinh(log(x+1) - tanh(x)).at n=7A013287
- Numbers k such that the continued fraction for sqrt(k) has period 22.at n=28A020361
- a(n)-th squarefree is sum of first k squarefrees for some k.at n=32A020643
- Numbers k such that Fibonacci(k) == -3 (mod k).at n=22A023164
- Convolution of (F(2), F(3), F(4), ...) and A001950.at n=9A023654
- Index of 7^n within the sequence of the numbers of the form 6^i*7^j.at n=50A025724
- T(2n,n-2), T given by A026681.at n=4A026684
- a(n) = (1/2)*A026907(2*n, n).at n=3A026909
- Least non-partition into positive n-th powers.at n=7A027609
- a(n) = n^2 + n + 6.at n=37A027691
- a(n) = Sum_{k=m..n} T(k,n-k), where m = floor((n+1)/2); a(n) is the n-th diagonal-sum of left justified array T given by A027948.at n=18A027959
- Numbers k that divide the (right) concatenation of all numbers <= k written in base 19 (most significant digit on left).at n=27A029464
- Numbers whose base-9 representation has 2 fewer 0's than 8's.at n=31A031496
- 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 18.at n=25A031516