864187823 has 2 divisors, whose sum is σ = 864187824. Its totient is φ = 864187822.

The previous prime is 864187787. The next prime is 864187853. The reversal of 864187823 is 328781468.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 864187823 - 2⁸ = 864187567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864187853) 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, 432093911 + 432093912.

It is an arithmetic number, because the mean of its divisors is an integer number (432093912).

Almost surely, 2^864187823 is an apocalyptic number.

864187823 is a deficient number, since it is larger than the sum of its proper divisors (1).

864187823 is an equidigital number, since it uses as much as digits as its factorization.

864187823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 47.

The square root of 864187823 is about 29397.0716738930. The cubic root of 864187823 is about 952.5096424832.

The spelling of 864187823 in words is "eight hundred sixty-four million, one hundred eighty-seven thousand, eight hundred twenty-three".