866969 has 2 divisors, whose sum is σ = 866970. Its totient is φ = 866968.

The previous prime is 866963. The next prime is 867001. The reversal of 866969 is 969668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 697225 + 169744 = 835^2 + 412^2 .

It is a cyclic number.

It is not a de Polignac number, because 866969 - 2⁴ = 866953 is a prime.

It is a super-3 number, since 3×866969³ = 1954933375267593627, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (866963) 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 as a sum of consecutive naturals, namely, 433484 + 433485.

It is an arithmetic number, because the mean of its divisors is an integer number (433485).

2⁸⁶⁶⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

866969 is a deficient number, since it is larger than the sum of its proper divisors (1).

866969 is an equidigital number, since it uses as much as digits as its factorization.

866969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 44.

The square root of 866969 is about 931.1117011401. Note that the first 3 decimals coincide. The cubic root of 866969 is about 95.3530354681.

The spelling of 866969 in words is "eight hundred sixty-six thousand, nine hundred sixty-nine".