866417 has 2 divisors, whose sum is σ = 866418. Its totient is φ = 866416.

The previous prime is 866399. The next prime is 866431. The reversal of 866417 is 714668.

866417 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 579121 + 287296 = 761^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 866417 - 2⁶ = 866353 is a prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 866417.

It is not a weakly prime, because it can be changed into another prime (866477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433208 + 433209.

It is an arithmetic number, because the mean of its divisors is an integer number (433209).

2⁸⁶⁶⁴¹⁷ is an apocalyptic number.

It is an amenable number.

866417 is a deficient number, since it is larger than the sum of its proper divisors (1).

866417 is an equidigital number, since it uses as much as digits as its factorization.

866417 is an evil number, because the sum of its binary digits is even.

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

The square root of 866417 is about 930.8152340825. The cubic root of 866417 is about 95.3327940483.

The spelling of 866417 in words is "eight hundred sixty-six thousand, four hundred seventeen".