244 (number)

244 (two hundred [and] forty-four) is the natural number following 243 and preceding 245.

← 243 244 245 →
← 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-four
Ordinal	244th (two hundred forty-fourth)
Factorization	22 × 61
Prime	no
Greek numeral	ΣΜΔ´
Roman numeral	CCXLIV, ccxliv
Binary	111101002
Ternary	1000013
Senary	10446
Octal	3648
Duodecimal	18412
Hexadecimal	F416

Additionally, 244 is:

• the sum of two nonzero fifth powers (244 = 1 + 243 = 1⁵ + 3⁵). ^[1]
• palindromic in bases 3 (100001₃), 11 (202₁₁), 60 (44₆₀), 121 (22₁₂₁), 243 (11₂₄₃).
• a Harshad number in bases 3, 9, 11, 61, 62, 81, 121, 122, 123 and 184.
• the second anti-perfect number, meaning that reversing the digits of the proper divisors of 244 and adding the results gives 244 back again. ^[2]
• part of the sequence 1, 2, 4, 8, 61, 221, 244, ... in which each number is formed by reversing the digits of the double of the previous number. ^[3]
• the number of non-isomorphic set-systems of weight 8

References

1. Sloane, N. J. A. (ed.). "SequenceA020896(Positive numbers n such that n = x^5 + y^5 has a solution in nonzero integers x, y)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
2. Sloane, N. J. A. (ed.). "SequenceA072228(Numbers n such that n = the sum of the reverses of the proper divisors of n)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
3. Sloane, N. J. A. (ed.). "SequenceA036447(Double and reverse digits)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.