3681785 has 4 divisors (see below), whose sum is σ = 4418148. Its totient is φ = 2945424.

The previous prime is 3681781. The next prime is 3681787. The reversal of 3681785 is 5871863.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5871863 = 37 ⋅158699.

It can be written as a sum of positive squares in 2 ways, for example, as 2096704 + 1585081 = 1448^2 + 1259^2 .

It is a cyclic number.

It is not a de Polignac number, because 3681785 - 2² = 3681781 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3681781) 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 3 ways as a sum of consecutive naturals, for example, 368174 + ... + 368183.

It is an arithmetic number, because the mean of its divisors is an integer number (1104537).

Almost surely, 2^3681785 is an apocalyptic number.

It is an amenable number.

3681785 is a deficient number, since it is larger than the sum of its proper divisors (736363).

3681785 is an equidigital number, since it uses as much as digits as its factorization.

3681785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736362.

The product of its digits is 40320, while the sum is 38.

The square root of 3681785 is about 1918.7978007075. The cubic root of 3681785 is about 154.4138108804.

The spelling of 3681785 in words is "three million, six hundred eighty-one thousand, seven hundred eighty-five".