247 (number)

Short description: Natural 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
Quaternary	33134
Quinary	14425
Senary	10516
Octal	3678
Duodecimal	18712
Hexadecimal	F716
Vigesimal	C720
Base 36	6V36

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

In mathematics

247 is:

• a semiprime.
• a brilliant number (the product of two primes with the same number of digits).
• a pentagonal number.
• 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.
• The mathematician and philosopher Alex Bellos suggested in 2014 that a candidate for the lowest uninteresting number would be 247 because it was, at the time, "the lowest number not to have its own page on Wikipedia". The lowest uninteresting number would by itself be interesting.

In other fields

• Sometimes used as an alternative to 24/7, an abbreviation which means "24 hours a day, 7 days a week".
• Approximate number of acres in a square kilometer (1 km² ≈ 247.10538 acres).