Number of the day: 864315

Sofia Kovalevskaya was born on this day 171 years ago.

Properties of the number 864315:

864315 = 3² × 5 × 19207 is the 795647^th composite number and is not squarefree.
864315 has 3 distinct prime factors, 12 divisors, 15 antidivisors and 460944 totatives.
864315 = 432158² - 432157² = 144054² - 144051² = 86434² - 86429² = 48022² - 48013² = 28818² - 28803² = 9626² - 9581² is the difference of 2 nonnegative squares in 6 ways.
864315 is the sum of 2 positive triangular numbers.
864315 is the difference of 2 positive pentagonal numbers in 2 ways.
864315 = 11² + 175² + 913² is the sum of 3 positive squares.
864315² = 518589² + 691452² is the sum of 2 positive squares in 1 way.
864315² is the sum of 3 positive squares.
864315 is a proper divisor of 661³³ - 1.
864315 = '86' + '4315' is the concatenation of 2 semiprime numbers.

The number 864315 belongs to the following On-Line Encyclopedia of Integer Sequences (OEIS) sequence (among others):

Sequence number and description below are taken from OEIS.
A249513: Expansion of -(4*x*sqrt(4*x^2+1)+8*x^2+1)/((2*x^2-1)*sqrt(4*x^2+1) +4*x^3+x).