866890 has 8 divisors (see below), whose sum is σ = 1560420. Its totient is φ = 346752.

The previous prime is 866869. The next prime is 866909. The reversal of 866890 is 98668.

866890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 772641 + 94249 = 879^2 + 307^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43335 + ... + 43354.

2⁸⁶⁶⁸⁹⁰ is an apocalyptic number.

866890 is a deficient number, since it is larger than the sum of its proper divisors (693530).

866890 is a wasteful number, since it uses less digits than its factorization.

866890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86696.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 866890 is about 931.0692777662. The cubic root of 866890 is about 95.3501391251.

The spelling of 866890 in words is "eight hundred sixty-six thousand, eight hundred ninety".