18840189 has 8 divisors (see below), whose sum is σ = 25197472. Its totient is φ = 12521520.

The previous prime is 18840179. The next prime is 18840209. The reversal of 18840189 is 98104881.

It is a happy number.

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

It is not a de Polignac number, because 18840189 - 2⁹ = 18839677 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 (18840179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8494 + ... + 10479.

It is an arithmetic number, because the mean of its divisors is an integer number (3149684).

Almost surely, 2^18840189 is an apocalyptic number.

It is an amenable number.

18840189 is a deficient number, since it is larger than the sum of its proper divisors (6357283).

18840189 is a wasteful number, since it uses less digits than its factorization.

18840189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19307.

The product of its (nonzero) digits is 18432, while the sum is 39.

The square root of 18840189 is about 4340.5286544383. The cubic root of 18840189 is about 266.0899172148.

The spelling of 18840189 in words is "eighteen million, eight hundred forty thousand, one hundred eighty-nine".