3831981 has 8 divisors (see below), whose sum is σ = 5120544. Its totient is φ = 2549040.

The previous prime is 3831937. The next prime is 3832001. The reversal of 3831981 is 1891383.

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

It is not a de Polignac number, because 3831981 - 2⁶ = 3831917 is a prime.

It is a super-2 number, since 2×3831981² = 29368156768722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3831911) 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 7 ways as a sum of consecutive naturals, for example, 595 + ... + 2831.

It is an arithmetic number, because the mean of its divisors is an integer number (640068).

Almost surely, 2^3831981 is an apocalyptic number.

It is an amenable number.

3831981 is a deficient number, since it is larger than the sum of its proper divisors (1288563).

3831981 is a wasteful number, since it uses less digits than its factorization.

3831981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2811.

The product of its digits is 5184, while the sum is 33.

The square root of 3831981 is about 1957.5446355064. The cubic root of 3831981 is about 156.4856250853.

The spelling of 3831981 in words is "three million, eight hundred thirty-one thousand, nine hundred eighty-one".