866312 has 8 divisors (see below), whose sum is σ = 1624350. Its totient is φ = 433152.

The previous prime is 866311. The next prime is 866329. The reversal of 866312 is 213668.

It can be written as a sum of positive squares in only one way, i.e., 857476 + 8836 = 926^2 + 94^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (866311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54137 + ... + 54152.

2⁸⁶⁶³¹² is an apocalyptic number.

It is an amenable number.

866312 is a deficient number, since it is larger than the sum of its proper divisors (758038).

866312 is a wasteful number, since it uses less digits than its factorization.

866312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108295 (or 108291 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 866312 is about 930.7588302025. The cubic root of 866312 is about 95.3289428051.

The spelling of 866312 in words is "eight hundred sixty-six thousand, three hundred twelve".