Number of the day: 866394740

Properties of the number 866394740:

866394740 = 2² × 5 × 2389 × 18133 is the 822016240^th composite number and is not squarefree.
866394740 has 4 distinct prime factors, 24 divisors, 23 antidivisors and 346393728 totatives.
866394740 has a prime digit sum 47 in base 10.
866394740 = 216598686² - 216598684² = 43319742² - 43319732² = 93054² - 88276² = 30078² - 6188² is the difference of 2 nonnegative squares in 4 ways.
866394740 is the difference of 2 positive pentagonal numbers in 4 ways.
866394740 = 15722² + 24884² = 3908² + 29174² = 14378² + 25684² = 10474² + 27508² is the sum of 2 positive squares in 4 ways.
866394740 = 220² + 758² + 29424² is the sum of 3 positive squares.
866394740² = 519836844² + 693115792² = 46021696² + 865171572² = 198067212² + 843450784² = 452940972² + 738569104² = 126495808² + 857110644² = 576237584² + 646985388² = 361426956² + 787407392² = 228023984² + 835849812² = 372032172² + 782452496² = 413069740² + 761586000² = 171845760² + 849181300² = 319090700² + 805494240² = 555920300² + 664524240² is the sum of 2 positive squares in 13 ways.
866394740² is the sum of 3 positive squares.
866394740 is a proper divisor of 1699⁹⁰⁶⁶ - 1.