189554978 has 16 divisors (see below), whose sum is σ = 286362240. Its totient is φ = 94103856.

The previous prime is 189554971. The next prime is 189555017. The reversal of 189554978 is 879455981.

It is not an unprimeable number, because it can be changed into a prime (189554971) 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, 256133 + ... + 256871.

It is an arithmetic number, because the mean of its divisors is an integer number (17897640).

Almost surely, 2^189554978 is an apocalyptic number.

189554978 is a deficient number, since it is larger than the sum of its proper divisors (96807262).

189554978 is a wasteful number, since it uses less digits than its factorization.

189554978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481.

The product of its digits is 3628800, while the sum is 56.

The square root of 189554978 is about 13767.8966440048. The cubic root of 189554978 is about 574.4405174183.

The spelling of 189554978 in words is "one hundred eighty-nine million, five hundred fifty-four thousand, nine hundred seventy-eight".