3981731 has 8 divisors (see below), whose sum is σ = 4369680. Its totient is φ = 3605472.

The previous prime is 3981709. The next prime is 3981739. The reversal of 3981731 is 1371893.

3981731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3981731 - 2¹⁴ = 3965347 is a prime.

It is a super-2 number, since 2×3981731² = 31708363512722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981739) 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, 2201 + ... + 3578.

It is an arithmetic number, because the mean of its divisors is an integer number (546210).

Almost surely, 2^3981731 is an apocalyptic number.

3981731 is a deficient number, since it is larger than the sum of its proper divisors (387949).

3981731 is a wasteful number, since it uses less digits than its factorization.

3981731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5845.

The product of its digits is 4536, while the sum is 32.

The square root of 3981731 is about 1995.4275231138. The cubic root of 3981731 is about 158.4980677583.

The spelling of 3981731 in words is "three million, nine hundred eighty-one thousand, seven hundred thirty-one".