864187879 has 2 divisors, whose sum is σ = 864187880. Its totient is φ = 864187878.

The previous prime is 864187871. The next prime is 864187889. The reversal of 864187879 is 978781468.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 864187879 - 2³ = 864187871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864187871) 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 as a sum of consecutive naturals, namely, 432093939 + 432093940.

It is an arithmetic number, because the mean of its divisors is an integer number (432093940).

Almost surely, 2^864187879 is an apocalyptic number.

864187879 is a deficient number, since it is larger than the sum of its proper divisors (1).

864187879 is an equidigital number, since it uses as much as digits as its factorization.

864187879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5419008, while the sum is 58.

The square root of 864187879 is about 29397.0726263688. The cubic root of 864187879 is about 952.5096630576.

The spelling of 864187879 in words is "eight hundred sixty-four million, one hundred eighty-seven thousand, eight hundred seventy-nine".