Number of the day: 639918

Properties of the number 639918:

639918 = 2 × 3² × 73 × 487 is the 587849^th composite number and is not squarefree.
639918 has 4 distinct prime factors, 24 divisors, 29 antidivisors and 209952 totatives.
639918 has a triangular digit sum 36 in base 10.
639918 is the sum of 2 positive triangular numbers.
639918 = 62² + 85² + 793² is the sum of 3 positive squares.
639918² = 420768² + 482130² is the sum of 2 positive squares in 1 way.
639918² is the sum of 3 positive squares.
639918 is a proper divisor of 41¹⁸ - 1.