189438 has 8 divisors (see below), whose sum is σ = 378888. Its totient is φ = 63144.

The previous prime is 189437. The next prime is 189439. The reversal of 189438 is 834981.

189438 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (189437) and next prime (189439).

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

189438 is an admirable number.

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

It is a junction number, because it is equal to n+sod(n) for n = 189399 and 189408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15781 + ... + 15792.

It is an arithmetic number, because the mean of its divisors is an integer number (47361).

2¹⁸⁹⁴³⁸ is an apocalyptic number.

189438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189438 is a wasteful number, since it uses less digits than its factorization.

189438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31578.

The product of its digits is 6912, while the sum is 33.

The square root of 189438 is about 435.2447587278. The cubic root of 189438 is about 57.4322327028.

The spelling of 189438 in words is "one hundred eighty-nine thousand, four hundred thirty-eight".