18730385 has 4 divisors (see below), whose sum is σ = 22476468. Its totient is φ = 14984304.

The previous prime is 18730367. The next prime is 18730391. The reversal of 18730385 is 58303781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58303781 = 23 ⋅2534947.

It can be written as a sum of positive squares in 2 ways, for example, as 11723776 + 7006609 = 3424^2 + 2647^2 .

It is a cyclic number.

It is not a de Polignac number, because 18730385 - 2¹² = 18726289 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 1873034 + ... + 1873043.

It is an arithmetic number, because the mean of its divisors is an integer number (5619117).

Almost surely, 2^18730385 is an apocalyptic number.

It is an amenable number.

18730385 is a deficient number, since it is larger than the sum of its proper divisors (3746083).

18730385 is an equidigital number, since it uses as much as digits as its factorization.

18730385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3746082.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 18730385 is about 4327.8614811475. The cubic root of 18730385 is about 265.5719697596.

The spelling of 18730385 in words is "eighteen million, seven hundred thirty thousand, three hundred eighty-five".