866369 has 6 divisors (see below), whose sum is σ = 1007874. Its totient is φ = 742560.

The previous prime is 866353. The next prime is 866389. The reversal of 866369 is 963668.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 659344 + 207025 = 812^2 + 455^2 .

It is not a de Polignac number, because 866369 - 2⁴ = 866353 is a prime.

It is a super-2 number, since 2×866369² = 1501190488322, which contains 22 as substring.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (866309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8792 + ... + 8889.

It is an arithmetic number, because the mean of its divisors is an integer number (167979).

2⁸⁶⁶³⁶⁹ is an apocalyptic number.

It is an amenable number.

866369 is a deficient number, since it is larger than the sum of its proper divisors (141505).

866369 is a wasteful number, since it uses less digits than its factorization.

866369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17695 (or 17688 counting only the distinct ones).

The product of its digits is 46656, while the sum is 38.

The square root of 866369 is about 930.7894498757. The cubic root of 866369 is about 95.3310335186.

The spelling of 866369 in words is "eight hundred sixty-six thousand, three hundred sixty-nine".