165438189 has 12 divisors (see below), whose sum is σ = 273104416. Its totient is φ = 94536072.

The previous prime is 165438131. The next prime is 165438191. The reversal of 165438189 is 981834561.

It is not a de Polignac number, because 165438189 - 2⁹ = 165437677 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165438089) 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, 1312939 + ... + 1313064.

Almost surely, 2^165438189 is an apocalyptic number.

It is an amenable number.

165438189 is a deficient number, since it is larger than the sum of its proper divisors (107666227).

165438189 is a wasteful number, since it uses less digits than its factorization.

165438189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626016 (or 2626013 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 165438189 is about 12862.2777531820. The cubic root of 165438189 is about 548.9657577655.

The spelling of 165438189 in words is "one hundred sixty-five million, four hundred thirty-eight thousand, one hundred eighty-nine".