1258
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 2052
- Proper Divisor Sum (Aliquot Sum)
- 794
- 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
- 576
- Möbius Function
- -1
- Radical
- 1258
- 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
- 39
- 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
- yes
- Odd
- no
Appears in sequences
- Coordination sequence T6 for Zeolite Code MTT.at n=22A008194
- Coordination sequence T1 for Zeolite Code TON.at n=22A008241
- Coordination sequence T2 for Zeolite Code DFO.at n=27A009876
- Numbers k such that the continued fraction for sqrt(k) has period 9.at n=12A010339
- a(n) = n*nextprime(n).at n=34A013636
- Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite DAC = Dachiardite Na5[Al5Si19O48].12H2O starting with a T2 atom.at n=10A019103
- Coordination sequence T2 for Zeolite Code CZP.at n=23A019457
- Numbers whose base-6 representation is the juxtaposition of two identical strings.at n=33A020334
- Sequence and first differences include all positive integers except 2.at n=44A022443
- a(n) = a(n-1) + b(n-2) for n >= 3, a( ) increasing, given a(1) = 1, a(2) = 3; where b( ) is complement of a( ).at n=45A022940
- a(n) = a(n-1) + c(n-2) for n >= 3, a( ) increasing, given a(1)=1, a(2)=2; where c( ) is complement of a( ).at n=45A022941
- Duplicate of A022443.at n=44A022948
- a(n) = a(n-1) + c(n) for n >= 3, a( ) increasing, given a(1)=1 a(2)=7; where c( ) is complement of a( ).at n=44A022950
- s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A023532, t = (odd natural numbers).at n=45A025072
- [ Sum{(log(j)-log(i))^2} ], 2 <= i < j <= n.at n=44A025206
- a(n) = [ 2nd elementary symmetric function of {sqrt(k+1)} ], k = 1,2,...,n.at n=15A025219
- a(n) = sum of the numbers between the two n's in A026338.at n=37A026341
- Least k such that 1+2+...+k >= E{1,2,...,n}, where E = 2nd elementary symmetric function.at n=48A027916
- Iterate the map in A006369 starting at 8.at n=44A028394
- a(n) = n*(n+3).at n=34A028552