866145 has 32 divisors (see below), whose sum is σ = 1619712. Its totient is φ = 387072.

The previous prime is 866123. The next prime is 866161. The reversal of 866145 is 541668.

It is not a de Polignac number, because 866145 - 2⁶ = 866081 is a prime.

It is a super-2 number, since 2×866145² = 1500414322050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

866145 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7609 + ... + 7721.

It is an arithmetic number, because the mean of its divisors is an integer number (50616).

2⁸⁶⁶¹⁴⁵ is an apocalyptic number.

It is an amenable number.

866145 is a deficient number, since it is larger than the sum of its proper divisors (753567).

866145 is a wasteful number, since it uses less digits than its factorization.

866145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201.

The product of its digits is 5760, while the sum is 30.

The square root of 866145 is about 930.6691141324. The cubic root of 866145 is about 95.3228168533.

The spelling of 866145 in words is "eight hundred sixty-six thousand, one hundred forty-five".