857389 has 8 divisors (see below), whose sum is σ = 933912. Its totient is φ = 782400.

The previous prime is 857369. The next prime is 857407. The reversal of 857389 is 983758.

857389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 100489 + 756900 = 317^2 + 870^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 857389 - 2⁵ = 857357 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 (857309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 987 + ... + 1639.

It is an arithmetic number, because the mean of its divisors is an integer number (116739).

857389 is a Friedman number, since it can be written as 9+(87+8)^3+5, using all its digits and the basic arithmetic operations.

2⁸⁵⁷³⁸⁹ is an apocalyptic number.

It is an amenable number.

857389 is a deficient number, since it is larger than the sum of its proper divisors (76523).

857389 is a wasteful number, since it uses less digits than its factorization.

857389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767.

The product of its digits is 60480, while the sum is 40.

The square root of 857389 is about 925.9530225665. The cubic root of 857389 is about 95.0005170794. Note that the first 3 decimals are identical.

The spelling of 857389 in words is "eight hundred fifty-seven thousand, three hundred eighty-nine".