866403 has 8 divisors (see below), whose sum is σ = 1283600. Its totient is φ = 577584.

The previous prime is 866399. The next prime is 866417. The reversal of 866403 is 304668.

866403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 866403 - 2² = 866399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 32089 = 866403 / (8 + 6 + 6 + 4 + 0 + 3).

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (866443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16018 + ... + 16071.

It is an arithmetic number, because the mean of its divisors is an integer number (160450).

2⁸⁶⁶⁴⁰³ is an apocalyptic number.

866403 is a deficient number, since it is larger than the sum of its proper divisors (417197).

866403 is a wasteful number, since it uses less digits than its factorization.

866403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32098 (or 32092 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 866403 is about 930.8077137626. The cubic root of 866403 is about 95.3322805672.

The spelling of 866403 in words is "eight hundred sixty-six thousand, four hundred three".