857320189 has 4 divisors (see below), whose sum is σ = 935258400. Its totient is φ = 779381980.

The previous prime is 857320187. The next prime is 857320253. The reversal of 857320189 is 981023758.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 857320189 - 2¹ = 857320187 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 (857320181) 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, 38969089 + ... + 38969110.

It is an arithmetic number, because the mean of its divisors is an integer number (233814600).

Almost surely, 2^857320189 is an apocalyptic number.

It is an amenable number.

857320189 is a deficient number, since it is larger than the sum of its proper divisors (77938211).

857320189 is a wasteful number, since it uses less digits than its factorization.

857320189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77938210.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 857320189 is about 29280.0305498475. The cubic root of 857320189 is about 949.9797554319.

The spelling of 857320189 in words is "eight hundred fifty-seven million, three hundred twenty thousand, one hundred eighty-nine".