18775385 has 4 divisors (see below), whose sum is σ = 22530468. Its totient is φ = 15020304.

The previous prime is 18775369. The next prime is 18775387. The reversal of 18775385 is 58357781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58357781 = 7109 ⋅8209.

It can be written as a sum of positive squares in 2 ways, for example, as 2647129 + 16128256 = 1627^2 + 4016^2 .

It is a cyclic number.

It is not a de Polignac number, because 18775385 - 2⁴ = 18775369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18775387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1877534 + ... + 1877543.

It is an arithmetic number, because the mean of its divisors is an integer number (5632617).

Almost surely, 2^18775385 is an apocalyptic number.

It is an amenable number.

18775385 is a deficient number, since it is larger than the sum of its proper divisors (3755083).

18775385 is an equidigital number, since it uses as much as digits as its factorization.

18775385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3755082.

The product of its digits is 235200, while the sum is 44.

The square root of 18775385 is about 4333.0572347939. The cubic root of 18775385 is about 265.7844797318.

The spelling of 18775385 in words is "eighteen million, seven hundred seventy-five thousand, three hundred eighty-five".