30,000 (thirty thousand) is the natural number that comes after 29,999 and before 30,001.
Selected numbers in the range 30001–39999
30001 to 30999
30029 = primorial prime
30030 = primorial
30203 = safe prime
30240 = harmonic divisor number
30323 = Sophie Germain prime and safe prime
30420 = pentagonal pyramidal number
30537 = Riordan number
30694 = open meandric number
30941 = first base 13 repunit prime
31000 to 31999
31116 = octahedral number
31337 = cousin prime, pronounced elite, an alternate way to spell 1337, an obfuscated alphabet made with numbers and punctuation, known and used in the gamer, hacker, and BBS cultures. 31395 = square pyramidal number 31397 = prime number followed by a record prime gap of 72, the first greater than 52 31688 = the number of years approximately equal to 1 trillion seconds 31721 = start of a prime quadruplet 31929 = Zeisel number
32000 to 32999
32043 = smallest number whose square is pandigital. 32045 = can be expressed as a sum of two squares in more ways than any smaller number. 32760 = harmonic divisor number 32761 = 1812, centered hexagonal number 32767 = 215 − 1, largest positive value for a signed (two's complement) 16-bit integer on a computer. 32768 = 215 = 85, maximum absolute value of a negative value for a signed (two's complement) 16-bit integer on a computer. 32800 = pentagonal pyramidal number 32993 = Leyland number
33000 to 33999
33333 = repdigit
33461 = Pell number, Markov number
33511 = square pyramidal number
33781 = octahedral number
34000 to 34999
34560 = 5 superfactorial
34790 = number of non-isomorphic set-systems of weight 13. 34841 = start of a prime quadruplet 34969 = favorite number of the Muppet character Count von Count
35000 to 35999
35720 = square pyramidal number
35840 = number of ounces in a long ton (2,240 pounds) 35890 = tribonacci number 35899 = alternating factorial 35937 = 333, chiliagonal number 35964 = digit-reassembly number
36000 to 36999
36100 = sum of the cubes of the first 19 positive integers
36463 – number of parallelogram polyominoes with 14 cells
36594 = octahedral number
37000 to 37999
37378 = semi-meandric number
37634 = third term of the Lucas–Lehmer sequence
37666 = Markov number
37926 = pentagonal pyramidal number
38000 to 38999
38024 = square pyramidal number
38209 = n such that n | (3n + 5) 38416 = 144 38807 = number of non-equivalent ways of expressing 10,000,000 as the sum of two prime numbers 38962 = Kaprekar number
39000 to 39999
39304 = 343
39559 = octahedral number
39648 = tetranacci number
Primes
There are 958 prime numbers between 30000 and 40000.