866432 has 32 divisors (see below), whose sum is σ = 1974720. Its totient is φ = 370944.

The previous prime is 866431. The next prime is 866443. The reversal of 866432 is 234668.

It is a tau number, because it is divible by the number of its divisors (32).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 866395 and 866404.

It is not an unprimeable number, because it can be changed into a prime (866431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413 + ... + 1379.

It is an arithmetic number, because the mean of its divisors is an integer number (61710).

2⁸⁶⁶⁴³² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (987360).

866432 is an abundant number, since it is smaller than the sum of its proper divisors (1108288).

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

866432 is an equidigital number, since it uses as much as digits as its factorization.

866432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988 (or 976 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 866432 is about 930.8232915006. The cubic root of 866432 is about 95.3333442005. Note that the first 4 decimals are identical.

The spelling of 866432 in words is "eight hundred sixty-six thousand, four hundred thirty-two".