18438369 has 8 divisors (see below), whose sum is σ = 24619392. Its totient is φ = 12274800.

The previous prime is 18438361. The next prime is 18438373. The reversal of 18438369 is 96383481.

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 18438369 - 2³ = 18438361 is a prime.

It is a super-2 number, since 2×18438369² = 679946902760322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18438369.

It is not an unprimeable number, because it can be changed into a prime (18438361) 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 7 ways as a sum of consecutive naturals, for example, 1657 + ... + 6294.

It is an arithmetic number, because the mean of its divisors is an integer number (3077424).

Almost surely, 2^18438369 is an apocalyptic number.

It is an amenable number.

18438369 is a deficient number, since it is larger than the sum of its proper divisors (6181023).

18438369 is an equidigital number, since it uses as much as digits as its factorization.

18438369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8727.

The product of its digits is 124416, while the sum is 42.

The square root of 18438369 is about 4293.9921984093. The cubic root of 18438369 is about 264.1846017184.

The spelling of 18438369 in words is "eighteen million, four hundred thirty-eight thousand, three hundred sixty-nine".