745
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 4
- Divisor Sum
- 900
- Proper Divisor Sum (Aliquot Sum)
- 155
- 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
- 592
- Möbius Function
- 1
- Radical
- 745
- Omega Function (Ω)
- 2
- 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
- 90
- Smith Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- yes
- 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
- no
- Odd
- yes
Names
- German
- siebenhundertfünfundvierzig· ordinal: siebenhundertfünfundvierzigste
- English
- seven hundred forty-five· ordinal: seven hundred forty-fifth
- Spanish
- setecientos cuarenta y cinco· ordinal: 745º
- French
- sept cent quarante-cinq· ordinal: sept cent quarante-cinqième
- Italian
- settecentoquarantacinque· ordinal: 745º
- Latin
- septingenti quadraginta quinque· ordinal: 745.
- Portuguese
- setecentos e quarenta e cinco· ordinal: 745º
Appears in sequences
- Numbers m such that Fibonacci(m) ends with m.at n=27A000350
- Primes multiplied by 5.at n=34A001750
- Numbers of the form 2^j + 3^k, for j and k >= 0.at n=58A004050
- Numbers whose sum of divisors is a square.at n=34A006532
- McKay-Thompson series of class 6b for the Monster group.at n=3A007261
- Add 2, then reverse digits!.at n=44A007396
- Numbers that are the sum of 2 nonzero squares in 2 or more ways.at n=51A007692
- Coordination sequence T1 for Zeolite Code DAC.at n=17A008067
- Coordination sequence T1 for Zeolite Code EAB.at n=20A008082
- Coordination sequence T4 for Zeolite Code MFS.at n=17A008176
- Coordination sequence T2 for Zeolite Code RUT.at n=18A009898
- Coordination sequence T1 for Zeolite Code VET.at n=17A009902
- Positive integers n such that 2^n == 2^5 (mod n).at n=30A015925
- Add 4, then reverse digits; start with 3.at n=19A016081
- X^m=X rings without normal forms: integers m > 1 for which there exist a prime p and integers a,b > 0 such that both p^a-1 and p^b-1 divide m-1 but p^lcm(a,b)-1 does not divide m-1.at n=41A019508
- Pseudoprimes to base 44.at n=13A020172
- Numbers k such that the continued fraction for sqrt(k) has period 14.at n=36A020353
- a(n) = n*(15*n - 1)/2.at n=10A022272
- Unique increasing sequence satisfying a(n) = a(n-2) + c(n-2); where c( ) is complement of a( ).at n=47A022939
- Simon Plouffe's conjectured extension of sequence A008368.at n=58A023054