189665487 has 12 divisors (see below), whose sum is σ = 298866984. Its totient is φ = 114948720.

The previous prime is 189665473. The next prime is 189665519. The reversal of 189665487 is 784566981.

189665487 is a `hidden beast` number, since 1 + 8 + 96 + 6 + 548 + 7 = 666.

189665487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 189665487 - 2¹⁵ = 189632719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189665387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 957808 + ... + 958005.

It is an arithmetic number, because the mean of its divisors is an integer number (24905582).

Almost surely, 2^189665487 is an apocalyptic number.

189665487 is a deficient number, since it is larger than the sum of its proper divisors (109201497).

189665487 is a wasteful number, since it uses less digits than its factorization.

189665487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915830 (or 1915827 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 189665487 is about 13771.9093447496. The cubic root of 189665487 is about 574.5521271046.

The spelling of 189665487 in words is "one hundred eighty-nine million, six hundred sixty-five thousand, four hundred eighty-seven".