37 (thirty-seven) is the natural number following 36 and preceding 38.
55 (fifty-five) is the natural number following 54 and preceding 56.
61 (sixty-one) is the natural number following 60 and preceding 62.
68 (sixty-eight) is the natural number following 67 and preceding 69. It is an even number.
109 is the natural number following 108 and preceding 110.
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.
400 is the natural number following 399 and preceding 401.
500 is the natural number following 499 and preceding 501.
700 is the natural number following 699 and preceding 701.
600 is the natural number following 599 and preceding 601.
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.
One million (1,000,000), or one thousand thousand, is the natural number following 999,999 and preceding 1,000,001. The word is derived from the early Italian millione, from mille, "thousand", plus the augmentative suffix -one.
100,000 (one hundred thousand) is the natural number following 99,999 and preceding 100,001. In scientific notation, it is written as 105.
181 is the natural number following 180 and preceding 182.
100,000,000 is the natural number following 99,999,999 and preceding 100,000,001.
189 is the natural number following 188 and preceding 190.
