189278378 has 16 divisors (see below), whose sum is σ = 286991424. Its totient is φ = 93619680.

The previous prime is 189278377. The next prime is 189278393. The reversal of 189278378 is 873872981.

It is not an unprimeable number, because it can be changed into a prime (189278377) by changing a digit.

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, 89651 + ... + 91737.

It is an arithmetic number, because the mean of its divisors is an integer number (17936964).

Almost surely, 2^189278378 is an apocalyptic number.

189278378 is a deficient number, since it is larger than the sum of its proper divisors (97713046).

189278378 is a wasteful number, since it uses less digits than its factorization.

189278378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2557.

The product of its digits is 1354752, while the sum is 53.

The square root of 189278378 is about 13757.8478694889. The cubic root of 189278378 is about 574.1609721450.

The spelling of 189278378 in words is "one hundred eighty-nine million, two hundred seventy-eight thousand, three hundred seventy-eight".