857942317 has 4 divisors (see below), whose sum is σ = 861689020. Its totient is φ = 854195616.

The previous prime is 857942299. The next prime is 857942341. The reversal of 857942317 is 713249758.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 729324036 + 128618281 = 27006^2 + 11341^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857942317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857942387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1873008 + ... + 1873465.

It is an arithmetic number, because the mean of its divisors is an integer number (215422255).

Almost surely, 2^857942317 is an apocalyptic number.

It is an amenable number.

857942317 is a deficient number, since it is larger than the sum of its proper divisors (3746703).

857942317 is a wasteful number, since it uses less digits than its factorization.

857942317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3746702.

The product of its digits is 423360, while the sum is 46.

The square root of 857942317 is about 29290.6523826288. The cubic root of 857942317 is about 950.2094891658.

The spelling of 857942317 in words is "eight hundred fifty-seven million, nine hundred forty-two thousand, three hundred seventeen".