189678 has 16 divisors (see below), whose sum is σ = 384336. Its totient is φ = 62400.

The previous prime is 189671. The next prime is 189691. The reversal of 189678 is 876981.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189671) by changing a digit.

189678 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 in 7 ways as a sum of consecutive naturals, for example, 450 + ... + 762.

It is an arithmetic number, because the mean of its divisors is an integer number (24021).

2¹⁸⁹⁶⁷⁸ is an apocalyptic number.

189678 is an abundant number, since it is smaller than the sum of its proper divisors (194658).

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

189678 is a wasteful number, since it uses less digits than its factorization.

189678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419.

The product of its digits is 24192, while the sum is 39.

The square root of 189678 is about 435.5203783981. The cubic root of 189678 is about 57.4564762003.

The spelling of 189678 in words is "one hundred eighty-nine thousand, six hundred seventy-eight".