3781646 has 32 divisors (see below), whose sum is σ = 6652800. Its totient is φ = 1594080.

The previous prime is 3781643. The next prime is 3781649. The reversal of 3781646 is 6461873.

3781646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3781643) and next prime (3781649).

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

Its product of digits (24192) is a multiple of the sum of its prime divisors (224).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3781643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34640 + ... + 34748.

It is an arithmetic number, because the mean of its divisors is an integer number (207900).

Almost surely, 2^3781646 is an apocalyptic number.

3781646 is a deficient number, since it is larger than the sum of its proper divisors (2871154).

3781646 is a wasteful number, since it uses less digits than its factorization.

3781646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224.

The product of its digits is 24192, while the sum is 35.

The square root of 3781646 is about 1944.6454689737. The cubic root of 3781646 is about 155.7974304762.

The spelling of 3781646 in words is "three million, seven hundred eighty-one thousand, six hundred forty-six".