1798
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
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 2880
- Proper Divisor Sum (Aliquot Sum)
- 1082
- 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
- 840
- Möbius Function
- -1
- Radical
- 1798
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 117
- 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
- a(n) = ceiling((1 + sum of preceding terms) / 2) starting with a(0) = 1.at n=19A005428
- 1 + (sum of first n odd primes - n)/2.at n=42A005521
- Coordination sequence T1 for Zeolite Code MEI.at n=31A008146
- Coordination sequence T1 for Scapolite.at n=27A008262
- Coordination sequence for Cr3Si, Cr position.at n=11A009928
- a(n) = floor(n*(n-1)*(n-2)/15).at n=31A011897
- Numbers k such that phi(k + 12) | sigma(k) for k not congruent to 0 (mod 3).at n=14A015850
- Smallest k such that the smallest palindrome > k in the Reverse and Add! trajectory of k is reached after exactly n iterations.at n=17A015994
- Numbers k such that the continued fraction for sqrt(k) has period 22.at n=38A020361
- a(0) = 0. For n > 0, smallest non-palindromic number k such that the smallest palindrome in the Reverse and Add! trajectory of k is reached after exactly n iterations.at n=18A023109
- Coordination sequence T6 for Zeolite Code MWW.at n=28A024991
- Numbers having period-2 7-digitized sequences.at n=35A031202
- Numbers k such that sigma(phi(k)) = sigma(k) where sigma is the sum of divisors function A000203 and phi is the Euler totient function A000010.at n=4A033631
- Least number of Reverse-then-add persistence n.at n=18A033866
- Fractional part of square root of a(n) starts with 4: first term of runs.at n=41A034110
- Number of partitions of n into parts not of the form 9k, 9k+2 or 9k-2. Also number of partitions with 1 part of size 1 and differences between parts at distance 3 are greater than 1.at n=33A035941
- Divisible by its 'even' sum of prime factors (counted with multiplicity).at n=44A036345
- 5-wave sequence.at n=26A038201
- G.f.: 1/(1 - 3 x - 3 x^2 + 4 x^3 + x^4 - x^5).at n=6A038342
- Period of n-countdown club-passing juggling pattern.at n=28A039720