866172 has 48 divisors (see below), whose sum is σ = 2217600. Its totient is φ = 262080.

The previous prime is 866161. The next prime is 866183. The reversal of 866172 is 271668.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (866161) and next prime (866183).

It is a d-powerful number, because it can be written as 8⁵ + 6² + 1 + 6⁵ + 7⁷ + 2¹¹ .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6547 + ... + 6677.

It is an arithmetic number, because the mean of its divisors is an integer number (46200).

2⁸⁶⁶¹⁷² 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 866172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1108800).

866172 is an abundant number, since it is smaller than the sum of its proper divisors (1351428).

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

866172 is a wasteful number, since it uses less digits than its factorization.

866172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 184 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 866172 is about 930.6836197119. The cubic root of 866172 is about 95.3238073300.

The spelling of 866172 in words is "eight hundred sixty-six thousand, one hundred seventy-two".