18775685 has 4 divisors (see below), whose sum is σ = 22530828. Its totient is φ = 15020544.

The previous prime is 18775681. The next prime is 18775697. The reversal of 18775685 is 58657781.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13082689 + 5692996 = 3617^2 + 2386^2 .

It is a cyclic number.

It is not a de Polignac number, because 18775685 - 2² = 18775681 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18775681) 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, 1877564 + ... + 1877573.

It is an arithmetic number, because the mean of its divisors is an integer number (5632707).

Almost surely, 2^18775685 is an apocalyptic number.

It is an amenable number.

18775685 is a deficient number, since it is larger than the sum of its proper divisors (3755143).

18775685 is an equidigital number, since it uses as much as digits as its factorization.

18775685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3755142.

The product of its digits is 470400, while the sum is 47.

The square root of 18775685 is about 4333.0918522459. The cubic root of 18775685 is about 265.7858953250.

The spelling of 18775685 in words is "eighteen million, seven hundred seventy-five thousand, six hundred eighty-five".