866966 has 16 divisors (see below), whose sum is σ = 1411344. Its totient is φ = 397824.

The previous prime is 866963. The next prime is 866969. The reversal of 866966 is 669668.

It is an interprime number because it is at equal distance from previous prime (866963) and next prime (866969).

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 7 ways as a sum of consecutive naturals, for example, 1166 + ... + 1758.

It is an arithmetic number, because the mean of its divisors is an integer number (88209).

2⁸⁶⁶⁹⁶⁶ is an apocalyptic number.

866966 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

866966 is a deficient number, since it is larger than the sum of its proper divisors (544378).

866966 is a wasteful number, since it uses less digits than its factorization.

866966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655.

The product of its digits is 93312, while the sum is 41.

The square root of 866966 is about 931.1100901612. The cubic root of 866966 is about 95.3529254836.

It can be divided in two parts, 86 and 6966, that multiplied together give a square (599076 = 774²).

The spelling of 866966 in words is "eight hundred sixty-six thousand, nine hundred sixty-six".