3987785 has 4 divisors (see below), whose sum is σ = 4785348. Its totient is φ = 3190224.

The previous prime is 3987769. The next prime is 3987791. The reversal of 3987785 is 5877893.

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 1882384 + 2105401 = 1372^2 + 1451^2 .

It is a cyclic number.

It is not a de Polignac number, because 3987785 - 2⁴ = 3987769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398774 + ... + 398783.

It is an arithmetic number, because the mean of its divisors is an integer number (1196337).

Almost surely, 2^3987785 is an apocalyptic number.

It is an amenable number.

3987785 is a deficient number, since it is larger than the sum of its proper divisors (797563).

3987785 is an equidigital number, since it uses as much as digits as its factorization.

3987785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797562.

The product of its digits is 423360, while the sum is 47.

The square root of 3987785 is about 1996.9439150862. The cubic root of 3987785 is about 158.5783562392.

The spelling of 3987785 in words is "three million, nine hundred eighty-seven thousand, seven hundred eighty-five".