2575
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 19
- Digital Root
- 1
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 3224
- Proper Divisor Sum (Aliquot Sum)
- 649
- 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
- 2040
- Möbius Function
- 0
- Radical
- 515
- 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
- yes
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 146
- 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
- no
- Odd
- yes
Appears in sequences
- Numbers that are the sum of 8 positive 7th powers.at n=12A003375
- a(n) = floor(n*phi^12), where phi is the golden ratio, A001622.at n=8A004927
- a(n) = (n + 3)*(n^2 + 6*n + 2)/6.at n=22A005286
- Numbers k giving rise to prime quadruples (30k+11, 30k+13, 30k+17, 30k+19).at n=30A014561
- a(n) is the concatenation of n and 3n.at n=24A019551
- Numbers k such that the continued fraction for sqrt(k) has period 40.at n=11A020379
- Place where n-th 1 occurs in A023131.at n=42A022793
- [ (4th elementary symmetric function of S(n))/(2nd elementary symmetric function of S(n)) ], where S(n) = {first n+3 odd positive integers}.at n=11A024205
- Convolution of Thue-Morse sequence A001285 with A008578 = {1, primes}.at n=31A029896
- Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 21 ones.at n=0A031789
- Lucky numbers with size of gaps equal to 12 (lower terms).at n=33A031894
- Every run of digits of n in base 4 has length 2.at n=23A033002
- Second 10-gonal (or decagonal) numbers: n*(4*n+3).at n=25A033954
- Multiplicity of highest weight (or singular) vectors associated with character chi_172 of Monster module.at n=37A034560
- Path-counting array T(i,j) obtained from array t in A038792 by T(i,j)=t(2i+1,j).at n=43A038738
- a(n) = n^2*(n^2+3)/4.at n=9A039623
- Denominators of continued fraction convergents to sqrt(320).at n=6A041605
- Numerators of continued fraction convergents to sqrt(650).at n=2A042248
- Denominators of continued fraction convergents to sqrt(710).at n=9A042367
- Denominators of continued fraction convergents to sqrt(939).at n=8A042817