866987 has 8 divisors (see below), whose sum is σ = 952560. Its totient is φ = 782560.

The previous prime is 866969. The next prime is 867001. The reversal of 866987 is 789668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866987 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 866987.

It is not an unprimeable number, because it can be changed into a prime (866917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2813 + ... + 3105.

It is an arithmetic number, because the mean of its divisors is an integer number (119070).

2⁸⁶⁶⁹⁸⁷ is an apocalyptic number.

866987 is a deficient number, since it is larger than the sum of its proper divisors (85573).

866987 is a wasteful number, since it uses less digits than its factorization.

866987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573.

The product of its digits is 145152, while the sum is 44.

The square root of 866987 is about 931.1213669549. The cubic root of 866987 is about 95.3536953697.

The spelling of 866987 in words is "eight hundred sixty-six thousand, nine hundred eighty-seven".