3981842 has 18 divisors (see below), whose sum is σ = 6422133. Its totient is φ = 1851232.

The previous prime is 3981839. The next prime is 3981847. The reversal of 3981842 is 2481893.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3644281 + 337561 = 1909^2 + 581^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=1411.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981847) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 47933 + ... + 48015.

Almost surely, 2^3981842 is an apocalyptic number.

3981842 is a deficient number, since it is larger than the sum of its proper divisors (2440291).

3981842 is an equidigital number, since it uses as much as digits as its factorization.

3981842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 102 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 3981842 is about 1995.4553365084. The cubic root of 3981842 is about 158.4995405786.

The spelling of 3981842 in words is "three million, nine hundred eighty-one thousand, eight hundred forty-two".