725
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 14
- Digital Root
- 5
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 930
- Proper Divisor Sum (Aliquot Sum)
- 205
- 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
- 560
- Möbius Function
- 0
- Radical
- 145
- 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
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 20
- Smith 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
Names
- German
- siebenhundertfünfundzwanzig· ordinal: siebenhundertfünfundzwanzigste
- English
- seven hundred twenty-five· ordinal: seven hundred twenty-fifth
- Spanish
- setecientos veinticinco· ordinal: 725º
- French
- sept cent vingt-cinq· ordinal: sept cent vingt-cinqième
- Italian
- settecentoventicinque· ordinal: 725º
- Latin
- septingenti viginti quinque· ordinal: 725.
- Portuguese
- setecentos e vinte e cinco· ordinal: 725º
Appears in sequences
- Number of positive integers <= 2^n of form x^2 + 2 y^2.at n=11A000067
- Numbers m such that Fibonacci(m) ends with m.at n=26A000350
- Numbers that are the sum of 2 squares in exactly 3 ways.at n=4A000443
- a(n) = (6*n+1)*(6*n+5).at n=4A001513
- Restricted partitions.at n=13A002573
- Discriminants of totally real quartic fields (see comments).at n=0A002769
- a(n) = (4*n+1)*(4*n+5).at n=6A003185
- Number of simple regular trivalent bicolored graphs with 2n nodes.at n=9A004066
- a(n) = floor(n*phi^7), where phi is the golden ratio, A001622.at n=25A004922
- Numerators of continued fraction convergents to cube root of 7.at n=4A005484
- a(n) = a(n-1) + 3*a(n-2).at n=8A006138
- Minimal discriminant of totally real number field of degree n.at n=3A006554
- Number of elements (a b, c d) in GL(2,Z) with |det| = 1, trace <= n and 0 <= a <= {b, c} <= d.at n=40A007295
- Add 2, then reverse digits!.at n=34A007396
- Successive integers produced by Conway's PRIMEGAME.at n=3A007542
- Numbers that are the sum of 2 nonzero squares in 2 or more ways.at n=48A007692
- a(n) is the largest odd number k such that 9, 11, ..., k are sums of 3 of first n odd primes.at n=52A007962
- Coordination sequence T5 for Zeolite Code EUO.at n=17A008100
- Coordination sequence T2 for Zeolite Code MEP.at n=16A008158
- Coordination sequence T3 for Zeolite Code MFI.at n=17A008166