857934859 has 2 divisors, whose sum is σ = 857934860. Its totient is φ = 857934858.

The previous prime is 857934841. The next prime is 857934887. The reversal of 857934859 is 958439758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 857934859 - 2⁷ = 857934731 is a prime.

It is not a weakly prime, because it can be changed into another prime (857934829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428967429 + 428967430.

It is an arithmetic number, because the mean of its divisors is an integer number (428967430).

Almost surely, 2^857934859 is an apocalyptic number.

857934859 is a deficient number, since it is larger than the sum of its proper divisors (1).

857934859 is an equidigital number, since it uses as much as digits as its factorization.

857934859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10886400, while the sum is 58.

The square root of 857934859 is about 29290.5250721116. The cubic root of 857934859 is about 950.2067358017.

The spelling of 857934859 in words is "eight hundred fifty-seven million, nine hundred thirty-four thousand, eight hundred fifty-nine".