18494503 has 2 divisors, whose sum is σ = 18494504. Its totient is φ = 18494502.

The previous prime is 18494501. The next prime is 18494513. The reversal of 18494503 is 30549481.

It is a weak prime.

It is an emirp because it is prime and its reverse (30549481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18494503 - 2¹ = 18494501 is a prime.

Together with 18494501, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18494501) 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 as a sum of consecutive naturals, namely, 9247251 + 9247252.

It is an arithmetic number, because the mean of its divisors is an integer number (9247252).

Almost surely, 2^18494503 is an apocalyptic number.

18494503 is a deficient number, since it is larger than the sum of its proper divisors (1).

18494503 is an equidigital number, since it uses as much as digits as its factorization.

18494503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 18494503 is about 4300.5235727758. The cubic root of 18494503 is about 264.4524257426.

The spelling of 18494503 in words is "eighteen million, four hundred ninety-four thousand, five hundred three".