3811638 has 16 divisors (see below), whose sum is σ = 8071920. Its totient is φ = 1195776.

The previous prime is 3811631. The next prime is 3811657. The reversal of 3811638 is 8361183.

3811638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3811631) 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 7 ways as a sum of consecutive naturals, for example, 18583 + ... + 18786.

It is an arithmetic number, because the mean of its divisors is an integer number (504495).

Almost surely, 2^3811638 is an apocalyptic number.

3811638 is an abundant number, since it is smaller than the sum of its proper divisors (4260282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3811638 is a wasteful number, since it uses less digits than its factorization.

3811638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37391.

The product of its digits is 3456, while the sum is 30.

The square root of 3811638 is about 1952.3416709173. The cubic root of 3811638 is about 156.2082196558.

It can be divided in two parts, 38 and 11638, that multiplied together give a palindrome (442244).

The spelling of 3811638 in words is "three million, eight hundred eleven thousand, six hundred thirty-eight".