857637189 has 12 divisors (see below), whose sum is σ = 1239065100. Its totient is φ = 571640064.

The previous prime is 857637173. The next prime is 857637239. The reversal of 857637189 is 981736758.

It can be written as a sum of positive squares in 2 ways, for example, as 135908964 + 721728225 = 11658^2 + 26865^2 .

It is not a de Polignac number, because 857637189 - 2⁴ = 857637173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857637119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71947 + ... + 83015.

It is an arithmetic number, because the mean of its divisors is an integer number (103255425).

Almost surely, 2^857637189 is an apocalyptic number.

It is an amenable number.

857637189 is a deficient number, since it is larger than the sum of its proper divisors (381427911).

857637189 is a wasteful number, since it uses less digits than its factorization.

857637189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19684 (or 19681 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The square root of 857637189 is about 29285.4432952619. The cubic root of 857637189 is about 950.0968281730.

The spelling of 857637189 in words is "eight hundred fifty-seven million, six hundred thirty-seven thousand, one hundred eighty-nine".