722
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 11
- Digital Root
- 2
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 3
Divisibility
- Divisor Count
- 6
- Divisor Sum
- 1143
- Proper Divisor Sum (Aliquot Sum)
- 421
- 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
- 342
- Möbius Function
- 0
- Radical
- 38
- 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
- yes
- Odd
- no
Names
- German
- siebenhundertzweiundzwanzig· ordinal: siebenhundertzweiundzwanzigste
- English
- seven hundred twenty-two· ordinal: seven hundred twenty-second
- Spanish
- setecientos veintidós· ordinal: 722º
- French
- sept cent vingt-deux· ordinal: sept cent vingt-deuxième
- Italian
- settecentoventidue· ordinal: 722º
- Latin
- septingenti viginti duo· ordinal: 722.
- Portuguese
- setecentos e vinte e dois· ordinal: 722º
Appears in sequences
- Numbers that are not the sum of 4 tetrahedral numbers.at n=41A000797
- Number of free planar polyenoids with n nodes and symmetry point group C_{2v}.at n=15A000936
- a(n) = ceiling(n^2/2).at n=38A000982
- a(n) = 2*n^2.at n=19A001105
- Number of doubly-regular tournaments of order 4n-1.at n=5A001121
- Number of partitions with no even part repeated; partitions of n in which no parts are multiples of 4.at n=24A001935
- Number of partitions into one kind of 1's, two kinds of 2's, and three kinds of 3's.at n=18A002597
- Beginnings of periodic unitary aliquot sequences.at n=59A003062
- Numbers which are the sum of 3 nonzero 4th powers.at n=23A003337
- Sums of distinct nonzero 4th powers.at n=21A003999
- Primes written backwards.at n=48A004087
- a(n) = n^2 + prime(n).at n=24A004232
- Numbers that are the sum of at most 3 nonzero 4th powers.at n=42A004832
- Sum of 4th powers of primes dividing n.at n=29A005065
- Sum of orders of all 2 X 2 matrices with entries mod n.at n=3A006045
- Percolation series for directed square lattice.at n=17A006462
- G.f.: Product_{k>=1} (1 + x^(2*k - 1)) / (1 - x^(2*k)).at n=28A006950
- Add 8, then reverse digits!.at n=7A007399
- a(n) = floor(n^2/2).at n=38A007590
- Coordination sequence T3 for Zeolite Code EMT.at n=22A008088