857257873 has 2 divisors, whose sum is σ = 857257874. Its totient is φ = 857257872.

The previous prime is 857257799. The next prime is 857257937. The reversal of 857257873 is 378752758.

It is a happy number.

857257873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 706655889 + 150601984 = 26583^2 + 12272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857257873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 857257873.

It is not a weakly prime, because it can be changed into another prime (857257273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428628936 + 428628937.

It is an arithmetic number, because the mean of its divisors is an integer number (428628937).

Almost surely, 2^857257873 is an apocalyptic number.

It is an amenable number.

857257873 is a deficient number, since it is larger than the sum of its proper divisors (1).

857257873 is an equidigital number, since it uses as much as digits as its factorization.

857257873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3292800, while the sum is 52.

The square root of 857257873 is about 29278.9663922755. The cubic root of 857257873 is about 949.9567378268.

The spelling of 857257873 in words is "eight hundred fifty-seven million, two hundred fifty-seven thousand, eight hundred seventy-three".