189687128 has 8 divisors (see below), whose sum is σ = 355663380. Its totient is φ = 94843560.

The previous prime is 189687119. The next prime is 189687131. The reversal of 189687128 is 821786981.

189687128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11855438 + ... + 11855453.

Almost surely, 2^189687128 is an apocalyptic number.

It is an amenable number.

189687128 is a deficient number, since it is larger than the sum of its proper divisors (165976252).

189687128 is a wasteful number, since it uses less digits than its factorization.

189687128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23710897 (or 23710893 counting only the distinct ones).

The product of its digits is 387072, while the sum is 50.

The square root of 189687128 is about 13772.6950158638. The cubic root of 189687128 is about 574.5739785757.

The spelling of 189687128 in words is "one hundred eighty-nine million, six hundred eighty-seven thousand, one hundred twenty-eight".