866241 has 8 divisors (see below), whose sum is σ = 1283360. Its totient is φ = 577476.

The previous prime is 866231. The next prime is 866279. The reversal of 866241 is 142668.

It is not a de Polignac number, because 866241 - 2⁹ = 865729 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: 32083 = 866241 / (8 + 6 + 6 + 2 + 4 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (866221) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 16015 + ... + 16068.

It is an arithmetic number, because the mean of its divisors is an integer number (160420).

2⁸⁶⁶²⁴¹ is an apocalyptic number.

It is an amenable number.

866241 is a deficient number, since it is larger than the sum of its proper divisors (417119).

866241 is a wasteful number, since it uses less digits than its factorization.

866241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32092 (or 32086 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 866241 is about 930.7206884990. The cubic root of 866241 is about 95.3263384547.

The spelling of 866241 in words is "eight hundred sixty-six thousand, two hundred forty-one".