864387187 has 2 divisors, whose sum is σ = 864387188. Its totient is φ = 864387186.

The previous prime is 864387163. The next prime is 864387239. The reversal of 864387187 is 781783468.

It is an a-pointer prime, because the next prime (864387239) can be obtained adding 864387187 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 864387187 - 2¹⁵ = 864354419 is a prime.

It is not a weakly prime, because it can be changed into another prime (864387107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432193593 + 432193594.

It is an arithmetic number, because the mean of its divisors is an integer number (432193594).

Almost surely, 2^864387187 is an apocalyptic number.

864387187 is a deficient number, since it is larger than the sum of its proper divisors (1).

864387187 is an equidigital number, since it uses as much as digits as its factorization.

864387187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1806336, while the sum is 52.

The square root of 864387187 is about 29400.4623603099. The cubic root of 864387187 is about 952.5828833252.

The spelling of 864387187 in words is "eight hundred sixty-four million, three hundred eighty-seven thousand, one hundred eighty-seven".