189643 has 2 divisors, whose sum is σ = 189644. Its totient is φ = 189642.

The previous prime is 189619. The next prime is 189653. The reversal of 189643 is 346981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189643 is a prime.

It is not a weakly prime, because it can be changed into another prime (189613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94821 + 94822.

It is an arithmetic number, because the mean of its divisors is an integer number (94822).

2¹⁸⁹⁶⁴³ is an apocalyptic number.

189643 is a deficient number, since it is larger than the sum of its proper divisors (1).

189643 is an equidigital number, since it uses as much as digits as its factorization.

189643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 189643 is about 435.4801947276. The cubic root of 189643 is about 57.4529419645.

The spelling of 189643 in words is "one hundred eighty-nine thousand, six hundred forty-three".