189418 has 4 divisors (see below), whose sum is σ = 284130. Its totient is φ = 94708.

The previous prime is 189407. The next prime is 189421. The reversal of 189418 is 814981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 814981 = 53 ⋅15377.

It can be written as a sum of positive squares in only one way, i.e., 154449 + 34969 = 393^2 + 187^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 189418.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47353 + ... + 47356.

2¹⁸⁹⁴¹⁸ is an apocalyptic number.

189418 is a deficient number, since it is larger than the sum of its proper divisors (94712).

189418 is an equidigital number, since it uses as much as digits as its factorization.

189418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94711.

The product of its digits is 2304, while the sum is 31.

The square root of 189418 is about 435.2217825431. The cubic root of 189418 is about 57.4302114873.

The spelling of 189418 in words is "one hundred eighty-nine thousand, four hundred eighteen".