18819685 has 4 divisors (see below), whose sum is σ = 22583628. Its totient is φ = 15055744.

The previous prime is 18819679. The next prime is 18819701. The reversal of 18819685 is 58691881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58691881 = 499 ⋅117619.

It can be written as a sum of positive squares in 2 ways, for example, as 4553956 + 14265729 = 2134^2 + 3777^2 .

It is a cyclic number.

It is not a de Polignac number, because 18819685 - 2⁵ = 18819653 is a prime.

It is a Duffinian number.

It is a congruent 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, 1881964 + ... + 1881973.

It is an arithmetic number, because the mean of its divisors is an integer number (5645907).

Almost surely, 2^18819685 is an apocalyptic number.

It is an amenable number.

18819685 is a deficient number, since it is larger than the sum of its proper divisors (3763943).

18819685 is an equidigital number, since it uses as much as digits as its factorization.

18819685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3763942.

The product of its digits is 138240, while the sum is 46.

The square root of 18819685 is about 4338.1660871848. The cubic root of 18819685 is about 265.9933525766.

The spelling of 18819685 in words is "eighteen million, eight hundred nineteen thousand, six hundred eighty-five".