18530999 has 4 divisors (see below), whose sum is σ = 18539664. Its totient is φ = 18522336.

The previous prime is 18530989. The next prime is 18531017. The reversal of 18530999 is 99903581.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18530999 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 (18530959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1439 + ... + 6255.

It is an arithmetic number, because the mean of its divisors is an integer number (4634916).

Almost surely, 2^18530999 is an apocalyptic number.

18530999 is a deficient number, since it is larger than the sum of its proper divisors (8665).

18530999 is an equidigital number, since it uses as much as digits as its factorization.

18530999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8664.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 18530999 is about 4304.7646857871. The cubic root of 18530999 is about 264.6262632361.

The spelling of 18530999 in words is "eighteen million, five hundred thirty thousand, nine hundred ninety-nine".