34 (thirty-four) is the natural number following 33 and preceding 35.
34 is the ninth distinct semiprime and has four divisors including one and itself. Its neighbors, 33 and 35, also are distinct semiprimes, having four divisors each, and 34 is the smallest number to be surrounded by numbers with the same number of divisors as it has. It is also in the first cluster of three distinct semiprimes, being within 33, 34, 35; the next such cluster of semiprimes is 85, 86, 87.
It is the ninth Fibonacci number and a companion Pell number. Since it is an odd-indexed Fibonacci number, 34 is a Markov number, appearing in solutions with other Fibonacci numbers, such as (1, 13, 34), (1, 34, 89), etc.
This number is the magic constant of a 4 by 4 normal magic square:
Thirty-four is a heptagonal number.
It has the aliquot sum, 20, in the following descending sequence 34,20,22,14,10,8,7,1. and it is the 6th composite member of the 7-aliquot tree.
There is no solution to the equation φ(x) = 34, making 34 a nontotient. Nor is there a solution to the equation x − φ(x) = 34, making 34 a noncototient.
The atomic number of selenium
One of the magic numbers in physics.
Messier object M34, a magnitude 6.0 open cluster in the constellation Perseus
The New General Catalogue object NGC 34, a peculiar galaxy in the constellation Cetus
The Saros number of the solar eclipse series which began on 1917 BC August and ended on 384 BC February. The duration of Saros series 34 was 1532.5 years, and it contained 86 solar eclipses.
The Saros number of the lunar eclipse series which began on 1633 BC May and ended on 335 BC June. The duration of Saros series 34 was 1298.1 years, and it contained 73 lunar eclipses.
The jersey number 34 has been retired by several North American sports teams in honor of past playing greats or other key figures:
In Major League Baseball:
The Houston Astros and Texas Rangers, both for Hall of Famer Nolan Ryan.
The Minnesota Twins, for Hall of Famer Kirby Puckett.
The Oakland Athletics and Milwaukee Brewers, both for Hall of Famer Rollie Fingers.
The Boston Red Sox have announced they will retire the number for David Ortiz in 2017.
Additionally, the Los Angeles Dodgers have not issued the number since the departure of Fernando Valenzuela following the 1990 season. Under current team policy, Valenzuela's number is not eligible for retirement because he is not in the Hall of Fame.
In the NBA:
The Houston Rockets, for Hall of Famer Hakeem Olajuwon.
The Los Angeles Lakers retired the number for Hall of Famer Shaquille O'Neal on April 2, 2013.
In the NFL:
The Chicago Bears, for Hall of Famer Walter "Sweetness" Payton.
The Houston Oilers, for Hall of Famer Earl Campbell. The franchise continues to honor the number in its current incarnation as the Tennessee Titans.
In the NCAA:
The Auburn University Tigers, for Hall of Famer Bo Jackson.
In The Count of Monte Cristo, Number 34 is how Edmond Dantès is referred to during his imprisonment in the Château d'If.
34th Street (Manhattan), a major cross-town street in New York City
34th Street (New York City Subway), multiple New York City subway stations
34 is also:
The traffic code of Istanbul, Turkey
"#34", a song by the Dave Matthews Band
The number of the French department Hérault
+34 is the code for international direct-dial phone calls to Spain
