189278 has 16 divisors (see below), whose sum is σ = 317520. Its totient is φ = 84096.

The previous prime is 189271. The next prime is 189307. The reversal of 189278 is 872981.

It is a happy number.

It is a super-2 number, since 2×189278² = 71652322568, which contains 22 as substring.

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 (189271) by changing a digit.

189278 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, 500 + ... + 792.

It is an arithmetic number, because the mean of its divisors is an integer number (19845).

2¹⁸⁹²⁷⁸ is an apocalyptic number.

189278 is a deficient number, since it is larger than the sum of its proper divisors (128242).

189278 is a wasteful number, since it uses less digits than its factorization.

189278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331.

The product of its digits is 8064, while the sum is 35.

The square root of 189278 is about 435.0609152751. The cubic root of 189278 is about 57.4160589934.

The spelling of 189278 in words is "one hundred eighty-nine thousand, two hundred seventy-eight".