18530899 has 2 divisors, whose sum is σ = 18530900. Its totient is φ = 18530898.

The previous prime is 18530891. The next prime is 18530903. The reversal of 18530899 is 99803581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18530899 - 2³ = 18530891 is a prime.

It is not a weakly prime, because it can be changed into another prime (18530891) 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, 9265449 + 9265450.

It is an arithmetic number, because the mean of its divisors is an integer number (9265450).

Almost surely, 2^18530899 is an apocalyptic number.

18530899 is a deficient number, since it is larger than the sum of its proper divisors (1).

18530899 is an equidigital number, since it uses as much as digits as its factorization.

18530899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 18530899 is about 4304.7530707347. The cubic root of 18530899 is about 264.6257872288.

The spelling of 18530899 in words is "eighteen million, five hundred thirty thousand, eight hundred ninety-nine".