866290 has 8 divisors (see below), whose sum is σ = 1559340. Its totient is φ = 346512.

The previous prime is 866279. The next prime is 866293. The reversal of 866290 is 92668.

It can be written as a sum of positive squares in 2 ways, for example, as 863041 + 3249 = 929^2 + 57^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a zygodrome in base 3.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 866290.

It is not an unprimeable number, because it can be changed into a prime (866293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43305 + ... + 43324.

2⁸⁶⁶²⁹⁰ is an apocalyptic number.

866290 is a deficient number, since it is larger than the sum of its proper divisors (693050).

866290 is a wasteful number, since it uses less digits than its factorization.

866290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86636.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 866290 is about 930.7470118136. The cubic root of 866290 is about 95.3281358385.

It can be divided in two parts, 866 and 290, that added together give a square (1156 = 34²).

The spelling of 866290 in words is "eight hundred sixty-six thousand, two hundred ninety".