866993 has 6 divisors (see below), whose sum is σ = 885222. Its totient is φ = 849120.

The previous prime is 866969. The next prime is 867001. The reversal of 866993 is 399668.

It can be written as a sum of positive squares in 3 ways, for example, as 113569 + 753424 = 337^2 + 868^2 .

It is not a de Polignac number, because 866993 - 2⁸ = 866737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 866993.

It is not an unprimeable number, because it can be changed into a prime (866933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3605 + ... + 3837.

It is an arithmetic number, because the mean of its divisors is an integer number (147537).

2⁸⁶⁶⁹⁹³ is an apocalyptic number.

It is an amenable number.

866993 is a deficient number, since it is larger than the sum of its proper divisors (18229).

866993 is an equidigital number, since it uses as much as digits as its factorization.

866993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 294 counting only the distinct ones).

The product of its digits is 69984, while the sum is 41.

The square root of 866993 is about 931.1245888709. The cubic root of 866993 is about 95.3539153349.

The spelling of 866993 in words is "eight hundred sixty-six thousand, nine hundred ninety-three".