747
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 18
- Digital Root
- 9
- Palindromic Number
- yes
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 4
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 1092
- Proper Divisor Sum (Aliquot Sum)
- 345
- 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
- 492
- Möbius Function
- 0
- Radical
- 249
- 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
- 46
- 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
- siebenhundertsiebenundvierzig· ordinal: siebenhundertsiebenundvierzigste
- English
- seven hundred forty-seven· ordinal: seven hundred forty-seventh
- Spanish
- setecientos cuarenta y siete· ordinal: 747º
- French
- sept cent quarante-sept· ordinal: sept cent quarante-septième
- Italian
- settecentoquarantasette· ordinal: 747º
- Latin
- septingenti quadraginta septem· ordinal: 747.
- Portuguese
- setecentos e quarenta e sete· ordinal: 747º
Appears in sequences
- Number of non-stereoisomeric paraffins with n carbon atoms.at n=15A000627
- Numbers k such that 17*2^k + 1 is prime.at n=9A002259
- Numbers k such that the k-th tetrahedral number is the sum of 2 tetrahedral numbers.at n=27A002311
- Fibonacci numbers written in base 9.at n=15A004692
- Octal palindromes which are also primes.at n=15A006341
- Oscillates under partition transform.at n=26A007211
- Add 2, then reverse digits!.at n=45A007396
- Coordination sequence T5 for Zeolite Code MFS.at n=17A008177
- Let j = | i - i_written_backwards |, k = j + j_written_backwards; then k is in this sequence.at n=10A008920
- Coordination sequence T4 for Zeolite Code RSN.at n=18A009888
- Positive integers n such that 2^n (mod n) == 2^9 (mod n).at n=44A015931
- Five iterations of Reverse and Add are needed to reach a palindrome.at n=22A015982
- Expansion of 1/(1-x^6-x^7-x^8-x^9-x^10).at n=42A017850
- Powers of fifth root of 7 rounded down.at n=17A018132
- Powers of fifth root of 7 rounded to nearest integer.at n=17A018133
- Let m=n+1; a(n) is the least positive integer s, not a multiple of m, such that if 1<=d<=m and (d,m)=1, then d divides one of the numbers s-m, s-2m, ..., s-m[ s/m ].at n=42A018205
- Divisors of 747.at n=5A018624
- Pseudoprimes to base 82.at n=14A020210
- Place where n-th 1 occurs in A023122.at n=34A022784
- Place where n-th 1 occurs in A023127.at n=24A022789