3981559 has 4 divisors (see below), whose sum is σ = 4022704. Its totient is φ = 3940416.

The previous prime is 3981541. The next prime is 3981563. The reversal of 3981559 is 9551893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3981559 - 2¹¹ = 3979511 is a prime.

It is a Duffinian number.

3981559 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981539) 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 3 ways as a sum of consecutive naturals, for example, 20427 + ... + 20620.

It is an arithmetic number, because the mean of its divisors is an integer number (1005676).

Almost surely, 2^3981559 is an apocalyptic number.

3981559 is a deficient number, since it is larger than the sum of its proper divisors (41145).

3981559 is an equidigital number, since it uses as much as digits as its factorization.

3981559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41144.

The product of its digits is 48600, while the sum is 40.

The square root of 3981559 is about 1995.3844241148. The cubic root of 3981559 is about 158.4957854963.

The spelling of 3981559 in words is "three million, nine hundred eighty-one thousand, five hundred fifty-nine".