866870 has 16 divisors (see below), whose sum is σ = 1628640. Its totient is φ = 331584.

The previous prime is 866869. The next prime is 866909. The reversal of 866870 is 78668.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 866870.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1655 + ... + 2114.

It is an arithmetic number, because the mean of its divisors is an integer number (101790).

2⁸⁶⁶⁸⁷⁰ is an apocalyptic number.

866870 is a deficient number, since it is larger than the sum of its proper divisors (761770).

866870 is a wasteful number, since it uses less digits than its factorization.

866870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3799.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 866870 is about 931.0585373649. The cubic root of 866870 is about 95.3494058458.

The spelling of 866870 in words is "eight hundred sixty-six thousand, eight hundred seventy".