866965 has 12 divisors (see below), whose sum is σ = 1144332. Its totient is φ = 630080.

The previous prime is 866963. The next prime is 866969. The reversal of 866965 is 569668.

866965 = T₅₄ + T₅₅ + ... + T₁₇₄.

It can be written as a sum of positive squares in 2 ways, for example, as 527076 + 339889 = 726^2 + 583^2 .

It is not a de Polignac number, because 866965 - 2¹ = 866963 is a prime.

It is a super-2 number, since 2×866965² = 1503256622450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a 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 in 11 ways as a sum of consecutive naturals, for example, 112 + ... + 1321.

It is an arithmetic number, because the mean of its divisors is an integer number (95361).

2⁸⁶⁶⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

866965 is a deficient number, since it is larger than the sum of its proper divisors (277367).

866965 is a wasteful number, since it uses less digits than its factorization.

866965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460 (or 1449 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 866965 is about 931.1095531676. The cubic root of 866965 is about 95.3528888220.

The spelling of 866965 in words is "eight hundred sixty-six thousand, nine hundred sixty-five".