857385717 has 16 divisors (see below), whose sum is σ = 1170021888. Its totient is φ = 558267840.

The previous prime is 857385691. The next prime is 857385721. The reversal of 857385717 is 717583758.

It is not a de Polignac number, because 857385717 - 2¹¹ = 857383669 is a prime.

It is a super-2 number, since 2×857385717² = 1470220535431208178, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 857385717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857385787) 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 in 15 ways as a sum of consecutive naturals, for example, 23367 + ... + 47547.

It is an arithmetic number, because the mean of its divisors is an integer number (73126368).

Almost surely, 2^857385717 is an apocalyptic number.

It is an amenable number.

857385717 is a deficient number, since it is larger than the sum of its proper divisors (312636171).

857385717 is a wasteful number, since it uses less digits than its factorization.

857385717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24460.

The product of its digits is 1646400, while the sum is 51.

The square root of 857385717 is about 29281.1495163697. The cubic root of 857385717 is about 950.0039582476.

The spelling of 857385717 in words is "eight hundred fifty-seven million, three hundred eighty-five thousand, seven hundred seventeen".