866147 has 4 divisors (see below), whose sum is σ = 868560. Its totient is φ = 863736.

The previous prime is 866123. The next prime is 866161. The reversal of 866147 is 741668.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 866147 - 2⁶ = 866083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548 + ... + 1425.

It is an arithmetic number, because the mean of its divisors is an integer number (217140).

2⁸⁶⁶¹⁴⁷ is an apocalyptic number.

866147 is a deficient number, since it is larger than the sum of its proper divisors (2413).

866147 is a wasteful number, since it uses less digits than its factorization.

866147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2412.

The product of its digits is 8064, while the sum is 32.

The square root of 866147 is about 930.6701886275. The cubic root of 866147 is about 95.3228902227.

The spelling of 866147 in words is "eight hundred sixty-six thousand, one hundred forty-seven".