864540187 has 16 divisors (see below), whose sum is σ = 1033912512. Its totient is φ = 707391360.

The previous prime is 864540179. The next prime is 864540239. The reversal of 864540187 is 781045468.

It is a cyclic number.

It is not a de Polignac number, because 864540187 - 2³ = 864540179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864540487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17764 + ... + 45217.

It is an arithmetic number, because the mean of its divisors is an integer number (64619532).

Almost surely, 2^864540187 is an apocalyptic number.

864540187 is a deficient number, since it is larger than the sum of its proper divisors (169372325).

864540187 is a wasteful number, since it uses less digits than its factorization.

864540187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63078.

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 864540187 is about 29403.0642450749. The cubic root of 864540187 is about 952.6390836735.

The spelling of 864540187 in words is "eight hundred sixty-four million, five hundred forty thousand, one hundred eighty-seven".