1850
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
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 3534
- Proper Divisor Sum (Aliquot Sum)
- 1684
- 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
- 720
- Möbius Function
- 0
- Radical
- 370
- Omega Function (Ω)
- 4
- 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
- 130
- 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
- Numbers that are the sum of 2 squares in exactly 3 ways.at n=18A000443
- Number of partitions of n into prime parts.at n=59A000607
- a(n) = sigma_2(n): sum of squares of divisors of n.at n=42A001157
- Triangular numbers plus quarter-squares: n*(n+1)/2 + floor((n+1)^2/4) (i.e., A000217(n) + A002620(n+1)).at n=49A001859
- a(n) = n^2 + 1.at n=43A002522
- a(n) = 2*a(n-1) + (n-1)*a(n-2).at n=7A005425
- Numbers k such that k*3^k + 1 is prime.at n=7A006552
- Earliest monotonic sequence fixed (apart from signs) under reversion.at n=10A007303
- Number of ordered 5-tuples of integers from [ 1..n ] with no global factor.at n=9A015650
- Expansion of 1/((1-2x)(1-5x)(1-9x)).at n=3A016298
- Numerator of sum of -2nd powers of divisors of n.at n=42A017667
- Numbers whose base-7 representation is the juxtaposition of two identical strings.at n=36A020335
- [ (4th elementary symmetric function of S(n))/(first elementary symmetric function of S(n)) ], where S(n) = {first n+3 positive integers congruent to 1 mod 4}.at n=2A024387
- [ (4th elementary symmetric function of P(n))/(first elementary symmetric function of P(n)) ], where P(n) = {first n+3 primes}.at n=3A024454
- Least m such that if r and s in {Pi/2 - atn(h): h = 1,2,...,n} satisfy r < s, then r < k/m < s for some integer k.at n=48A024832
- Numbers that are the sum of 2 nonzero squares in exactly 3 ways.at n=17A025286
- Numbers that are the sum of 2 nonzero squares in 3 or more ways.at n=19A025294
- Numbers that are the sum of 2 distinct nonzero squares in exactly 3 ways.at n=16A025304
- Numbers that are the sum of 2 distinct nonzero squares in 3 or more ways.at n=18A025313
- Number of independent subsets of nodes in graph formed from n-fold subdivision of 6-dimensional simplex.at n=3A027733