189445555 has 24 divisors (see below), whose sum is σ = 248491152. Its totient is φ = 137831616.

The previous prime is 189445541. The next prime is 189445583. The reversal of 189445555 is 555544981.

It is not a de Polignac number, because 189445555 - 2⁷ = 189445427 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 405432 + ... + 405898.

It is an arithmetic number, because the mean of its divisors is an integer number (10353798).

Almost surely, 2^189445555 is an apocalyptic number.

189445555 is a deficient number, since it is larger than the sum of its proper divisors (59045597).

189445555 is an equidigital number, since it uses as much as digits as its factorization.

189445555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643 (or 564 counting only the distinct ones).

The product of its digits is 720000, while the sum is 46.

The square root of 189445555 is about 13763.9222244243. The cubic root of 189445555 is about 574.3299617996.

The spelling of 189445555 in words is "one hundred eighty-nine million, four hundred forty-five thousand, five hundred fifty-five".