18133389 has 12 divisors (see below), whose sum is σ = 27163136. Its totient is φ = 12088764.

The previous prime is 18133387. The next prime is 18133393. The reversal of 18133389 is 98333181.

It is not a de Polignac number, because 18133389 - 2¹ = 18133387 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 (18133387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37069 + ... + 37554.

Almost surely, 2^18133389 is an apocalyptic number.

It is an amenable number.

18133389 is a deficient number, since it is larger than the sum of its proper divisors (9029747).

18133389 is an frugal number, since it uses more digits than its factorization.

18133389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74638 (or 74626 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 18133389 is about 4258.3317155900. The cubic root of 18133389 is about 262.7199136715.

The spelling of 18133389 in words is "eighteen million, one hundred thirty-three thousand, three hundred eighty-nine".