Number of the day: 7222017

Happy Casual π Day!

Properties of the number 7222017:

7222017 is a cyclic number.
7222017 = 3 × 11 × 218849 is a sphenic number and squarefree.
7222017 has 3 distinct prime factors, 8 divisors, 11 antidivisors and 4376960 totatives.
7222017 has a semiprime digit sum 21 in base 10.
7222017 has a Fibonacci digit sum 21 in base 10.
7222017 has a triangular digit sum 21 in base 10.
7222017 = 3611009² - 3611008² = 1203671² - 1203668² = 328279² - 328268² = 109441² - 109408² is the difference of 2 nonnegative squares in 4 ways.
7222017 is the difference of 2 positive pentagonal numbers in 2 ways.
7222017 = 53² + 218² + 2678² is the sum of 3 positive squares.
7222017² = 3016200² + 6562017² is the sum of 2 positive squares in 1 way.
7222017² is the sum of 3 positive squares.
7222017 is a proper divisor of 397⁶⁸³⁹ - 1.