189857 has 4 divisors (see below), whose sum is σ = 190740. Its totient is φ = 188976.

The previous prime is 189853. The next prime is 189859. The reversal of 189857 is 758981.

189857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 130321 + 59536 = 361^2 + 244^2 .

It is a cyclic number.

It is not a de Polignac number, because 189857 - 2² = 189853 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 189857.

It is not an unprimeable number, because it can be changed into a prime (189851) 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, 119 + ... + 627.

It is an arithmetic number, because the mean of its divisors is an integer number (47685).

2¹⁸⁹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

189857 is a deficient number, since it is larger than the sum of its proper divisors (883).

189857 is an equidigital number, since it uses as much as digits as its factorization.

189857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882.

The product of its digits is 20160, while the sum is 38.

The square root of 189857 is about 435.7258312288. The cubic root of 189857 is about 57.4745444980.

The spelling of 189857 in words is "one hundred eighty-nine thousand, eight hundred fifty-seven".