# 19945 (number)

19,945 (nineteen thousand nine hundred forty-five) is an odd five-digits composite number following 19944 and preceding 19946. In scientific notation, it is written as 1.9945 × 104. The sum of its digits is 28. It has a total of 2 prime factors and 4 positive divisors. There are 15,952 positive integers (up to 19945) that are relatively prime to 19945.

## Basic properties

• Is Prime? No
• Number parity Odd
• Number length 5
• Sum of Digits 28
• Digital Root 1

## Name

Short name 19 thousand 945 nineteen thousand nine hundred forty-five

## Notation

Scientific notation 1.9945 × 104 19.945 × 103

## Prime Factorization of 19945

Prime Factorization 5 × 3989

Composite number
Distinct Factors Total Factors Radical ω(n) 2 Total number of distinct prime factors Ω(n) 2 Total number of prime factors rad(n) 19945 Product of the distinct prime numbers λ(n) 1 Returns the parity of Ω(n), such that λ(n) = (-1)Ω(n) μ(n) 1 Returns: 1, if n has an even number of prime factors (and is square free) −1, if n has an odd number of prime factors (and is square free) 0, if n has a squared prime factor Λ(n) 0 Returns log(p) if n is a power pk of any prime p (for any k >= 1), else returns 0

The prime factorization of 19,945 is 5 × 3989. Since it has a total of 2 prime factors, 19,945 is a composite number.

## Divisors of 19945

1, 5, 3989, 19945

4 divisors

 Even divisors 0 4 4 0
Total Divisors Sum of Divisors Aliquot Sum τ(n) 4 Total number of the positive divisors of n σ(n) 23940 Sum of all the positive divisors of n s(n) 3995 Sum of the proper positive divisors of n A(n) 5985 Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n)) G(n) 141.227 Returns the nth root of the product of n divisors H(n) 3.3325 Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 19,945 can be divided by 4 positive divisors (out of which 0 are even, and 4 are odd). The sum of these divisors (counting 19,945) is 23,940, the average is 5,985.

## Other Arithmetic Functions (n = 19945)

1 φ(n) n
Euler Totient Carmichael Lambda Prime Pi φ(n) 15952 Total number of positive integers not greater than n that are coprime to n λ(n) 3988 Smallest positive number such that aλ(n) ≡ 1 (mod n) for all a coprime to n π(n) ≈ 2260 Total number of primes less than or equal to n r2(n) 16 The number of ways n can be represented as the sum of 2 squares

There are 15,952 positive integers (less than 19,945) that are coprime with 19,945. And there are approximately 2,260 prime numbers less than or equal to 19,945.

## Divisibility of 19945

 m n mod m 2 3 4 5 6 7 8 9 1 1 1 0 1 2 1 1

The number 19,945 is divisible by 5.

## Classification of 19945

• Arithmetic
• Semiprime
• Deficient

• Polite

• Square Free

### Other numbers

• LucasCarmichael

## Base conversion (19945)

Base System Value
2 Binary 100110111101001
3 Ternary 1000100201
4 Quaternary 10313221
5 Quinary 1114240
6 Senary 232201
8 Octal 46751
10 Decimal 19945
12 Duodecimal b661
20 Vigesimal 29h5
36 Base36 fe1

## Basic calculations (n = 19945)

### Multiplication

n×y
 n×2 39890 59835 79780 99725

### Division

n÷y
 n÷2 9972.5 6648.33 4986.25 3989

### Exponentiation

ny
 n2 397803025 7934181333625 158247246699150625 3156241335414559215625

### Nth Root

y√n
 2√n 141.227 27.1193 11.8839 7.24381

## 19945 as geometric shapes

### Circle

 Diameter 39890 125318 1.24974e+09

### Sphere

 Volume 3.32346e+13 4.99894e+09 125318

### Square

Length = n
 Perimeter 79780 3.97803e+08 28206.5

### Cube

Length = n
 Surface area 2.38682e+09 7.93418e+12 34545.8

### Equilateral Triangle

Length = n
 Perimeter 59835 1.72254e+08 17272.9

### Triangular Pyramid

Length = n
 Surface area 6.89015e+08 9.35052e+11 16285
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