16189189 has 8 divisors (see below), whose sum is σ = 16542360. Its totient is φ = 15840000.

The previous prime is 16189181. The next prime is 16189193. The reversal of 16189189 is 98198161.

It is a happy number.

16189189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1520289 + 14668900 = 1233^2 + 3830^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 16189189 - 2³ = 16189181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16189181) 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, 8089 + ... + 9889.

It is an arithmetic number, because the mean of its divisors is an integer number (2067795).

Almost surely, 2^16189189 is an apocalyptic number.

It is an amenable number.

16189189 is a deficient number, since it is larger than the sum of its proper divisors (353171).

16189189 is a wasteful number, since it uses less digits than its factorization.

16189189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991.

The product of its digits is 31104, while the sum is 43.

The square root of 16189189 is about 4023.5791280898. The cubic root of 16189189 is about 252.9735009506.

The spelling of 16189189 in words is "sixteen million, one hundred eighty-nine thousand, one hundred eighty-nine".