55 (fifty-five) is the natural number following 54 and preceding 56.
1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.
300 is the natural number following 299 and preceding 301.
500 is the natural number following 499 and preceding 501.
700 is the natural number following 699 and preceding 701.
800 is the natural number following 799 and preceding 801.
900 is the natural number following 899 and preceding 901. It is the square of 30 and the sum of Euler's totient function for the first 54 positive integers. In base 10 it is a Harshad number. It is also the first number to be the square of a sphenic number.
2000 is a natural number following 1999 and preceding 2001.
3000 is the natural number following 2999 and preceding 3001. It is the smallest number requiring thirteen letters in English.
4000 is the natural number following 3999 and preceding 4001. It is a decagonal number.
5000 is the natural number following 4999 and preceding 5001. Five thousand is the largest isogrammic numeral in the English language.
6000 is the natural number following 5999 and preceding 6001.
7000 is the natural number following 6999 and preceding 7001.
8000 is the natural number following 7999 and preceding 8001.
1,000,000,000 is the natural number following 999,999,999 and preceding 1,000,000,001. With a number, "billion" can be abbreviated as b, bil or bn.
181 is the natural number following 180 and preceding 182.
5 (five) is a number, numeral and digit. It is the natural number, and cardinal number, following 4 and preceding 6, and is a prime number. It has garnered attention throughout history in part because distal extremities in humans typically contain five digits.
20,000 is the natural number that comes after 19,999 and before 20,001.
40,000 is the natural number that comes after 39,999 and before 40,001. It is the square of 200.
9000 is the natural number following 8999 and preceding 9001.
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