Recognised as Number
-1,389
- Negative
- Odd
- 4 digits
-1,389 is an odd 4-digit integer and the negative of 1,389. It has 4 divisors and a digital root of 3.
Number properties
ParityOddnot divisible by 2
SignNegative
Absolute value1,389
Digit count4
Digit sum21
Digit product216
Multiplicative persistence3times the digit product can be taken before one digit is left
Digital root3repeated digit sum
PalindromicNoreads differently backwards
Factors & divisors
Prime factorisation−1 × 3 × 463
Distinct prime factors23, 463
Number of divisors4
Sum of divisors σ(n)1,856
SquarefreeYesno repeated prime factor
All divisors1, 3, 463, 1,3894 in total
Arithmetic
Representations
Decimal-1,389
Binary1010110110111 bits
Octal2555
Hexadecimal56D
Base 3612L
In wordsminus one thousand, three hundred and eighty-nine
Ordinalminus one thousand, three hundred and eighty-ninth
Scientific notation-1.389 × 10^3
Engineering notation-1.389 × 10^3
In other bases
Ternary1220110base 3; the most digit-efficient integer base after e: 7 digits
Quinary21024base 5; one hand: 5 digits
Septenary4023base 7: 4 digits
Nonary1813base 9; each digit is two ternary digits: 4 digits
Duodecimal979base 12; divides by 2, 3, 4 and 6, which is why eggs and inches come in twelves: 3 digits
Vigesimal399base 20; hands and feet, and the Mayan and Yoruba systems: 3 digits
Sexagesimal23:9base 60; Babylonian, and still how an hour and a circle are divided: 2 digits
Balanced ternaryT1010TT0digits −1, 0 and +1 written T, 0 and 1; negation is swapping T and 1, so no sign is needed
Negabinary111110010111base −2; place values alternate 1, −2, 4, −8, so every integer has exactly one form without a sign
Bit-level
1111101010010011
Bit length11 bitsto write the magnitude
Set bits7the population count, or Hamming weight
Zero bits4within that length
Bit parityodd7 set bits, so odd; not the same as the number itself being odd
Highest set bitbit 10worth 1,024
Lowest set bitbit 00 trailing zeros
Power of twoNo
Bytes205 6d
Gray code11111011011n XOR (n >> 1); successive values differ in exactly one bit
At each machine width
16-bit1111101010010011two's complement
32-bit11111111111111111111101010010011two's complement
64-bit1111111111111111111111111111111111111111111111111111101010010011two's complement
One's complement0000010101101100at 16 bits, every bit flipped
Bits reversed1100100101011111at 16 bits
Rotated left by 11111010100100111at 16 bits, wrapping
Shifted left by 1-101011011010= -2,778, no wrap
Shifted right by 1-1010110111= -694, discarding the low bit
These bits as a double6.86257182 × 10^-321≈IEEE-754 binary64 reinterpretation of the same 64 bits (subnormal)
Powers & multiples
-1,389 to the power 21,929,321
-1,389 to the power 3-2,679,826,869
-1,389 to the power 43,722,279,521,041
-1,389 to the power 5-5,170,246,254,725,949
First ten multiples-1,389, -2,778, -4,167, -5,556, -6,945, -8,334, -9,723, -11,112, -12,501, -13,890
Powers of twoBetween 2^10 (1,024) and 2^11 (2,048)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3Yes
Divisible by 4No, remainder 1
Divisible by 5No, remainder 4
Divisible by 6No, remainder 3
Divisible by 7No, remainder 3
Divisible by 8No, remainder 5
Divisible by 9No, remainder 3
Divisible by 10No, remainder 9
Divisible by 11No, remainder 3
Divisible by 12No, remainder 9
Divisible by 100No, remainder 89
As a percentage & fraction
As a percentage-138,900%
-1,389% as a decimal-13.89
-1,389% of 100-1,389
-1,389% of 1,000-13,890
As a fraction of 100-1,389/100
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