864887 has 2 divisors, whose sum is σ = 864888. Its totient is φ = 864886.

The previous prime is 864883. The next prime is 864901. The reversal of 864887 is 788468.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 864887 - 2² = 864883 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432443 + 432444.

It is an arithmetic number, because the mean of its divisors is an integer number (432444).

2⁸⁶⁴⁸⁸⁷ is an apocalyptic number.

864887 is a deficient number, since it is larger than the sum of its proper divisors (1).

864887 is an equidigital number, since it uses as much as digits as its factorization.

864887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 41.

The square root of 864887 is about 929.9930107264. The cubic root of 864887 is about 95.2766451360.

The spelling of 864887 in words is "eight hundred sixty-four thousand, eight hundred eighty-seven".