18108203 has 4 divisors (see below), whose sum is σ = 18529368. Its totient is φ = 17687040.

The previous prime is 18108173. The next prime is 18108217. The reversal of 18108203 is 30280181.

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

It is a cyclic number.

It is not a de Polignac number, because 18108203 - 2¹⁶ = 18042667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18108253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210518 + ... + 210603.

It is an arithmetic number, because the mean of its divisors is an integer number (4632342).

Almost surely, 2^18108203 is an apocalyptic number.

18108203 is a deficient number, since it is larger than the sum of its proper divisors (421165).

18108203 is an equidigital number, since it uses as much as digits as its factorization.

18108203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421164.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 18108203 is about 4255.3734266219. The cubic root of 18108203 is about 262.5982241633.

Adding to 18108203 its reverse (30280181), we get a palindrome (48388384).

The spelling of 18108203 in words is "eighteen million, one hundred eight thousand, two hundred three".