864935857 has 2 divisors, whose sum is σ = 864935858. Its totient is φ = 864935856.

The previous prime is 864935849. The next prime is 864935873. The reversal of 864935857 is 758539468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 723825216 + 141110641 = 26904^2 + 11879^2 .

It is a cyclic number.

It is not a de Polignac number, because 864935857 - 2³ = 864935849 is a prime.

It is a super-2 number, since 2×864935857² = 1496228073448648898, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 864935798 and 864935807.

It is not a weakly prime, because it can be changed into another prime (864935807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432467928 + 432467929.

It is an arithmetic number, because the mean of its divisors is an integer number (432467929).

Almost surely, 2^864935857 is an apocalyptic number.

It is an amenable number.

864935857 is a deficient number, since it is larger than the sum of its proper divisors (1).

864935857 is an equidigital number, since it uses as much as digits as its factorization.

864935857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7257600, while the sum is 55.

The square root of 864935857 is about 29409.7918557748. The cubic root of 864935857 is about 952.7843914428.

The spelling of 864935857 in words is "eight hundred sixty-four million, nine hundred thirty-five thousand, eight hundred fifty-seven".