3981843 has 12 divisors (see below), whose sum is σ = 5885880. Its totient is φ = 2592576.

The previous prime is 3981839. The next prime is 3981847. The reversal of 3981843 is 3481893.

It is an interprime number because it is at equal distance from previous prime (3981839) and next prime (3981847).

It is not a de Polignac number, because 3981843 - 2² = 3981839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3981798 and 3981807.

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 11 ways as a sum of consecutive naturals, for example, 4758 + ... + 5531.

It is an arithmetic number, because the mean of its divisors is an integer number (490490).

Almost surely, 2^3981843 is an apocalyptic number.

3981843 is a deficient number, since it is larger than the sum of its proper divisors (1904037).

3981843 is a wasteful number, since it uses less digits than its factorization.

3981843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10338 (or 10335 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 3981843 is about 1995.4555870778. The cubic root of 3981843 is about 158.4995538471.

The spelling of 3981843 in words is "three million, nine hundred eighty-one thousand, eight hundred forty-three".