2425
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 13
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 3038
- Proper Divisor Sum (Aliquot Sum)
- 613
- 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
- 1920
- Möbius Function
- 0
- Radical
- 485
- 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
- 164
- 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 2 squares in exactly 3 ways.at n=21A000443
- 10-gonal (or decagonal) numbers: a(n) = n*(4*n-3).at n=25A001107
- a(n) = n concatenated with n + 1.at n=23A001704
- Coordination sequence T1 for Zeolite Code BOG.at n=35A008049
- Coordination sequence T4 for Zeolite Code PAU.at n=36A008222
- Expansion of E.g.f. cos(sin(tan(x))), even powers only.at n=4A009039
- Expansion of e.g.f.: exp(sinh(tanh(x))).at n=8A009222
- Pseudoprimes to base 24.at n=15A020152
- Pseudoprimes to base 43.at n=33A020171
- Pseudoprimes to base 93.at n=24A020221
- Numbers k such that the continued fraction for sqrt(k) has period 21.at n=19A020360
- Numbers that are the sum of 2 nonzero squares in exactly 3 ways.at n=20A025286
- Numbers that are the sum of 2 nonzero squares in 3 or more ways.at n=26A025294
- Numbers that are the sum of 2 distinct nonzero squares in exactly 3 ways.at n=19A025304
- Numbers that are the sum of 2 distinct nonzero squares in 3 or more ways.at n=25A025313
- Number of partitions of n in which the least part is even.at n=35A026805
- Odd 10-gonal (or decagonal) numbers.at n=12A028993
- Numbers k that divide the (left) concatenation of all numbers <= k written in base 11 (most significant digit on left).at n=16A029480
- Pair up the numbers.at n=12A030656
- Nonsquarefree k such that Pell equation x^2 - k*y^2 = -1 is soluble.at n=21A031397