189189189 has 20 divisors (see below), whose sum is σ = 322990624. Its totient is φ = 108107784.

The previous prime is 189189181. The next prime is 189189199. The reversal of 189189189 is 981981981.

It is not a de Polignac number, because 189189189 - 2³ = 189189181 is a prime.

It is a Duffinian number.

189189189 is a modest number, since divided by 189189 gives 189 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189189181) 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 19 ways as a sum of consecutive naturals, for example, 166267 + ... + 167400.

Almost surely, 2^189189189 is an apocalyptic number.

It is an amenable number.

189189189 is a deficient number, since it is larger than the sum of its proper divisors (133801435).

189189189 is an equidigital number, since it uses as much as digits as its factorization.

189189189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333686 (or 333677 counting only the distinct ones).

The product of its digits is 373248, while the sum is 54.

The square root of 189189189 is about 13754.6061012302. The cubic root of 189189189 is about 574.0707753867.

The spelling of 189189189 in words is "one hundred eighty-nine million, one hundred eighty-nine thousand, one hundred eighty-nine".