18819385 has 16 divisors (see below), whose sum is σ = 24413760. Its totient is φ = 13844160.

The previous prime is 18819377. The next prime is 18819389. The reversal of 18819385 is 58391881.

It is not a de Polignac number, because 18819385 - 2³ = 18819377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18819389) 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 15 ways as a sum of consecutive naturals, for example, 26890 + ... + 27580.

It is an arithmetic number, because the mean of its divisors is an integer number (1525860).

Almost surely, 2^18819385 is an apocalyptic number.

It is an amenable number.

18819385 is a deficient number, since it is larger than the sum of its proper divisors (5594375).

18819385 is a wasteful number, since it uses less digits than its factorization.

18819385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128.

The product of its digits is 69120, while the sum is 43.

The square root of 18819385 is about 4338.1315102242. The cubic root of 18819385 is about 265.9919391908.

The spelling of 18819385 in words is "eighteen million, eight hundred nineteen thousand, three hundred eighty-five".