866487 has 8 divisors (see below), whose sum is σ = 1159936. Its totient is φ = 575352.

The previous prime is 866477. The next prime is 866513. The reversal of 866487 is 784668.

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

It is not a de Polignac number, because 866487 - 2⁴ = 866471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866417) 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, 708 + ... + 1494.

It is an arithmetic number, because the mean of its divisors is an integer number (144992).

2⁸⁶⁶⁴⁸⁷ is an apocalyptic number.

866487 is a deficient number, since it is larger than the sum of its proper divisors (293449).

866487 is a wasteful number, since it uses less digits than its factorization.

866487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157.

The product of its digits is 64512, while the sum is 39.

The square root of 866487 is about 930.8528347704. The cubic root of 866487 is about 95.3353613709.

The spelling of 866487 in words is "eight hundred sixty-six thousand, four hundred eighty-seven".