18109389 has 8 divisors (see below), whose sum is σ = 24210432. Its totient is φ = 12040640.

The previous prime is 18109387. The next prime is 18109393. The reversal of 18109389 is 98390181.

It is a happy number.

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 18109389 - 2¹ = 18109387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18109381) 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, 6732 + ... + 9029.

It is an arithmetic number, because the mean of its divisors is an integer number (3026304).

Almost surely, 2^18109389 is an apocalyptic number.

It is an amenable number.

18109389 is a deficient number, since it is larger than the sum of its proper divisors (6101043).

18109389 is a wasteful number, since it uses less digits than its factorization.

18109389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16147.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 18109389 is about 4255.5127775628. The cubic root of 18109389 is about 262.6039570108.

The spelling of 18109389 in words is "eighteen million, one hundred nine thousand, three hundred eighty-nine".