189859 has 2 divisors, whose sum is σ = 189860. Its totient is φ = 189858.

The previous prime is 189853. The next prime is 189877. The reversal of 189859 is 958981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189859 - 2³ = 189851 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (189851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94929 + 94930.

It is an arithmetic number, because the mean of its divisors is an integer number (94930).

2¹⁸⁹⁸⁵⁹ is an apocalyptic number.

189859 is a deficient number, since it is larger than the sum of its proper divisors (1).

189859 is an equidigital number, since it uses as much as digits as its factorization.

189859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 40.

The square root of 189859 is about 435.7281262439. The cubic root of 189859 is about 57.4747463142.

The spelling of 189859 in words is "one hundred eighty-nine thousand, eight hundred fifty-nine".