165388389 has 8 divisors (see below), whose sum is σ = 220641120. Its totient is φ = 110197296.

The previous prime is 165388367. The next prime is 165388397. The reversal of 165388389 is 983883561.

165388389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165388389 - 2⁵ = 165388357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165388889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8734 + ... + 20175.

It is an arithmetic number, because the mean of its divisors is an integer number (27580140).

Almost surely, 2^165388389 is an apocalyptic number.

It is an amenable number.

165388389 is a deficient number, since it is larger than the sum of its proper divisors (55252731).

165388389 is a wasteful number, since it uses less digits than its factorization.

165388389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30819.

The product of its digits is 1244160, while the sum is 51.

The square root of 165388389 is about 12860.3417139670. The cubic root of 165388389 is about 548.9106692387.

The spelling of 165388389 in words is "one hundred sixty-five million, three hundred eighty-eight thousand, three hundred eighty-nine".