18138353 has 4 divisors (see below), whose sum is σ = 18161268. Its totient is φ = 18115440.

The previous prime is 18138343. The next prime is 18138361. The reversal of 18138353 is 35383181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11336689 + 6801664 = 3367^2 + 2608^2 .

It is a cyclic number.

It is not a de Polignac number, because 18138353 - 2²⁴ = 1361137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18138343) 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 3 ways as a sum of consecutive naturals, for example, 10226 + ... + 11867.

It is an arithmetic number, because the mean of its divisors is an integer number (4540317).

Almost surely, 2^18138353 is an apocalyptic number.

It is an amenable number.

18138353 is a deficient number, since it is larger than the sum of its proper divisors (22915).

18138353 is an equidigital number, since it uses as much as digits as its factorization.

18138353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22914.

The product of its digits is 8640, while the sum is 32.

The square root of 18138353 is about 4258.9145330706. The cubic root of 18138353 is about 262.7438846028.

The spelling of 18138353 in words is "eighteen million, one hundred thirty-eight thousand, three hundred fifty-three".