18387103 has 6 divisors (see below), whose sum is σ = 21389136. Its totient is φ = 15760332.

The previous prime is 18387091. The next prime is 18387121. The reversal of 18387103 is 30178381.

It is not a de Polignac number, because 18387103 - 2⁵ = 18387071 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 (18387163) 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 5 ways as a sum of consecutive naturals, for example, 187575 + ... + 187672.

It is an arithmetic number, because the mean of its divisors is an integer number (3564856).

Almost surely, 2^18387103 is an apocalyptic number.

18387103 is a deficient number, since it is larger than the sum of its proper divisors (3002033).

18387103 is an equidigital number, since it uses as much as digits as its factorization.

18387103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375261 (or 375254 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18387103 is about 4288.0185400719. The cubic root of 18387103 is about 263.9395283518.

The spelling of 18387103 in words is "eighteen million, three hundred eighty-seven thousand, one hundred three".