857943673 has 2 divisors, whose sum is σ = 857943674. Its totient is φ = 857943672.

The previous prime is 857943617. The next prime is 857943703. The reversal of 857943673 is 376349758.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 794788864 + 63154809 = 28192^2 + 7947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857943673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 857943673.

It is not a weakly prime, because it can be changed into another prime (857943773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428971836 + 428971837.

It is an arithmetic number, because the mean of its divisors is an integer number (428971837).

Almost surely, 2^857943673 is an apocalyptic number.

It is an amenable number.

857943673 is a deficient number, since it is larger than the sum of its proper divisors (1).

857943673 is an equidigital number, since it uses as much as digits as its factorization.

857943673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 52.

The square root of 857943673 is about 29290.6755299361. The cubic root of 857943673 is about 950.2099897758.

The spelling of 857943673 in words is "eight hundred fifty-seven million, nine hundred forty-three thousand, six hundred seventy-three".