866406 has 16 divisors (see below), whose sum is σ = 1743984. Its totient is φ = 286944.

The previous prime is 866399. The next prime is 866417. The reversal of 866406 is 604668.

It is a happy number.

866406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 816 + ... + 1548.

It is an arithmetic number, because the mean of its divisors is an integer number (108999).

2⁸⁶⁶⁴⁰⁶ is an apocalyptic number.

866406 is an abundant number, since it is smaller than the sum of its proper divisors (877578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866406 is a wasteful number, since it uses less digits than its factorization.

866406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 866406 is about 930.8093252648. The cubic root of 866406 is about 95.3323905993.

The spelling of 866406 in words is "eight hundred sixty-six thousand, four hundred six".