866394 has 24 divisors (see below), whose sum is σ = 1896960. Its totient is φ = 285768.

The previous prime is 866389. The next prime is 866399. The reversal of 866394 is 493668.

866394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (866389) and next prime (866399).

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (866399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2097 + ... + 2475.

It is an arithmetic number, because the mean of its divisors is an integer number (79040).

2⁸⁶⁶³⁹⁴ is an apocalyptic number.

866394 is an abundant number, since it is smaller than the sum of its proper divisors (1030566).

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

866394 is a wasteful number, since it uses less digits than its factorization.

866394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 511 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 866394 is about 930.8028792392. The cubic root of 866394 is about 95.3319504692.

The spelling of 866394 in words is "eight hundred sixty-six thousand, three hundred ninety-four".