18530903 has 2 divisors, whose sum is σ = 18530904. Its totient is φ = 18530902.

The previous prime is 18530899. The next prime is 18530933. The reversal of 18530903 is 30903581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18530903 - 2² = 18530899 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18530933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9265451 + 9265452.

It is an arithmetic number, because the mean of its divisors is an integer number (9265452).

Almost surely, 2^18530903 is an apocalyptic number.

18530903 is a deficient number, since it is larger than the sum of its proper divisors (1).

18530903 is an equidigital number, since it uses as much as digits as its factorization.

18530903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 18530903 is about 4304.7535353374. The cubic root of 18530903 is about 264.6258062691.

The spelling of 18530903 in words is "eighteen million, five hundred thirty thousand, nine hundred three".