18041785 has 4 divisors (see below), whose sum is σ = 21650148. Its totient is φ = 14433424.

The previous prime is 18041767. The next prime is 18041791. The reversal of 18041785 is 58714081.

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 2383936 + 15657849 = 1544^2 + 3957^2 .

It is a cyclic number.

It is not a de Polignac number, because 18041785 - 2⁵ = 18041753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18041785.

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, 1804174 + ... + 1804183.

It is an arithmetic number, because the mean of its divisors is an integer number (5412537).

Almost surely, 2^18041785 is an apocalyptic number.

It is an amenable number.

18041785 is a deficient number, since it is larger than the sum of its proper divisors (3608363).

18041785 is an equidigital number, since it uses as much as digits as its factorization.

18041785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3608362.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 18041785 is about 4247.5622420395. The cubic root of 18041785 is about 262.2767747017.

The spelling of 18041785 in words is "eighteen million, forty-one thousand, seven hundred eighty-five".