18078103 has 4 divisors (see below), whose sum is σ = 18498568. Its totient is φ = 17657640.

The previous prime is 18078097. The next prime is 18078113. The reversal of 18078103 is 30187081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30187081 = 1249 ⋅24169.

It is a cyclic number.

It is not a de Polignac number, because 18078103 - 2¹⁷ = 17947031 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 (18078113) 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, 210168 + ... + 210253.

It is an arithmetic number, because the mean of its divisors is an integer number (4624642).

Almost surely, 2^18078103 is an apocalyptic number.

18078103 is a deficient number, since it is larger than the sum of its proper divisors (420465).

18078103 is an equidigital number, since it uses as much as digits as its factorization.

18078103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420464.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 18078103 is about 4251.8352508064. The cubic root of 18078103 is about 262.4526439138.

It can be divided in two parts, 18078 and 103, that added together give a palindrome (18181).

The spelling of 18078103 in words is "eighteen million, seventy-eight thousand, one hundred three".