18994103 has 4 divisors (see below), whose sum is σ = 19606848. Its totient is φ = 18381360.

The previous prime is 18994069. The next prime is 18994141. The reversal of 18994103 is 30149981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30149981 = 577 ⋅52253.

It is a cyclic number.

It is not a de Polignac number, because 18994103 - 2⁶ = 18994039 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 (18994163) 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, 306326 + ... + 306387.

It is an arithmetic number, because the mean of its divisors is an integer number (4901712).

Almost surely, 2^18994103 is an apocalyptic number.

18994103 is a deficient number, since it is larger than the sum of its proper divisors (612745).

18994103 is an equidigital number, since it uses as much as digits as its factorization.

18994103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612744.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 18994103 is about 4358.2224587554. Note that the first 3 decimals coincide. The cubic root of 18994103 is about 266.8125557621.

The spelling of 18994103 in words is "eighteen million, nine hundred ninety-four thousand, one hundred three".