247 (number)

← 246 247 248 →
← 240 241 242 243 244 245 246 247 248 249 → List of numbers ; Integers ; ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred forty-seven
Ordinal	247th; (two hundred forty-seventh)
Factorization	13 × 19
Greek numeral	ΣΜΖ´
Roman numeral	CCXLVII
Binary	111101112
Ternary	1000113
Senary	10516
Octal	3678
Duodecimal	18712
Hexadecimal	F716

Last updated September 12, 2024

247 (two hundred [and] forty-seven) is the natural number following 246 and preceding 248.

Additionally, 247 is:

a semiprime.
a brilliant number (the product of two primes with the same number of digits).^[1]
a pentagonal number.^[2]
palindromic in base 18 (DD₁₈).
a Harshad number in bases 10, 14, 19, 20, 27, 39, 40, 58, 77, 79, 115, 118, 229 and 235.
the smallest number which can be expressed as the difference between two integers that contain together all the decimal digits 0–9. i.e. 247 = 50123 - 49876.^[3]

Related Research Articles

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92 (ninety-two) is the natural number following 91 and preceding 93.

100 or one hundred is the natural number following 99 and preceding 101.

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.

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.

It is:

135 is the natural number following 134 and preceding 136.

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.

20,000 is the natural number that comes after 19,999 and before 20,001.

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References

↑ "Sloane's A078972 : Brilliant numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
↑ "Sloane's A000326 : Pentagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
↑ Friedman, Erich. "What's Special About This Number?". stetson.edu. Archived from the original on 23 February 2018. Retrieved 15 April 2016.

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[1] "Sloane's A078972 : Brilliant numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.

[2] "Sloane's A000326 : Pentagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.

[3] Friedman, Erich. "What's Special About This Number?". stetson.edu. Archived from the original on 23 February 2018. Retrieved 15 April 2016.

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