3981439 has 16 divisors (see below), whose sum is σ = 5137920. Its totient is φ = 2993760.

The previous prime is 3981421. The next prime is 3981449. The reversal of 3981439 is 9341893.

It is not a de Polignac number, because 3981439 - 2⁵ = 3981407 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 3981398 and 3981407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981449) 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 15 ways as a sum of consecutive naturals, for example, 1342 + ... + 3124.

It is an arithmetic number, because the mean of its divisors is an integer number (321120).

Almost surely, 2^3981439 is an apocalyptic number.

3981439 is a deficient number, since it is larger than the sum of its proper divisors (1156481).

3981439 is a wasteful number, since it uses less digits than its factorization.

3981439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830.

The product of its digits is 23328, while the sum is 37.

The square root of 3981439 is about 1995.3543544945. The cubic root of 3981439 is about 158.4941931816.

The spelling of 3981439 in words is "three million, nine hundred eighty-one thousand, four hundred thirty-nine".