Selected 7-digit numbers (1,000,000 - 9,999,999)

* 1,000,003 - Smallest 7-digit prime number
* 1,046,527 - Carol number
* 1,048,576 = 220 (power of two), 2,116-gonal number, an 8,740-gonal number and a 174,764-gonal number, the number of bytes in a mebibyte, the number of kibibytes in a gibibyte, and so on. Also the most rows that Microsoft Excel (Microsoft Office 2007) can accept in a single worksheet.
* 1,048,976 - Leyland number
* 1,050,623 - Kynea number
* 1,058,576 - Leyland number
* 1,084,051 - Keith number
* 1,089,270 - harmonic divisor number
* 1,136,689 - Pell number, Markov number
* 1,234,567 - Smarandache consecutive number (base 10 digits are in numerical order)
* 1,278,818 - Markov number
* 1,346,269 - Fibonacci number, Markov number
* 1,421,280 - harmonic divisor number
* 1,441,440 - colossally abundant number
* 1,441,889 - Markov number
* 1,539,720 - harmonic divisor number
* 1,563,372 - Wedderburn-Etherington number
* 1,594,323 = 313
* 1,596,520 - Leyland number
* 1,647,086 - Leyland number
* 1,679,616 = 68
* 1,686,049 - Markov number
* 1,741,725 - equal to the sum of the seventh power of its digits
* 1,771,561 = 116 = 1213 = 13312, also, Commander Spock's estimate for the tribble population in the Star Trek episode "The Trouble With Tribbles"
* 1,941,760 - Leyland number
* 1,953,125 = 59
* 2,012,174 - Leyland number
* 2,012,674 - Markov number
* 2,097,152 = 221, power of two
* 2,097,593 - prime Leyland number
* 2,124,679 - Wolstenholme prime
* 2,178,309 - Fibonacci number
* 2,356,779 - Motzkin number
* 2,423,525 - Markov number
* 2,674,440 - Catalan number
* 2,744,210 - Pell number
* 2,796,203 - Wagstaff prime
* 2,922,509 - Markov number
* 3,263,442 - product of the first five terms of Sylvester's sequence
* 3,263,443 - sixth term of Sylvester's sequence
* 3,276,509 - Markov number
* 3,301,819 - alternating factorial
* 3,524,578 - Fibonacci number, Markov number
* 3,626,149 - Wedderburn-Etherington number
* 3,628,800 = 10!
* 4,037,913 - sum of the first ten factorials
* 4,190,207 - Carol number
* 4,194,304 = 222, power of two
* 4,194,788 - Leyland number
* 4,198,399 - Kynea number
* 4,208,945 - Leyland number
* 4,210,818 - equal to the sum of the seventh powers of its digits
* 4,213,597 - Bell number
* 4,400,489 - Markov number
* 4,782,969 = 314
* 4,785,713 - Leyland number
* 4,826,809 = 136
* 5,134,240 - the largest number that cannot be expressed as the sum of distinct fourth powers
* 5,702,887 - Fibonacci number
* 5,764,801 = 78
* 6,536,382 - Motzkin number
* 6,625,109 - Pell number, Markov number
* 7,453,378 - Markov number
* 7,861,953 - Leyland number
* 7,913,837 - Keith number
* 8,000,000 - Used to represent infinity in Japanese mythology
* 8,388,608 = 223, power of two
* 8,389,137 - Leyland number
* 8,399,329 - Markov number
* 8,436,379 - Wedderburn-Etherington number
* 8,675,309 - A hit song for Tommy Tutone (also a twin prime)
* 8,675,311 - A twin prime
* 8,946,176 - self-descriptive number in base 8
* 9,227,465 - Fibonacci number, Markov number
* 9,369,319 - Newman-Shanks-Williams prime
* 9,647,009 - Markov number
* 9,694,845 - Catalan number
* 9,765,625 = 510
* 9,800,817 - equal to the sum of the seventh powers of its digits
* 9,865,625 - Leyland number
* 9,926,315 - equal to the sum of the seventh powers of its digits
* 9,999,991 - Largest 7 digit prime number