3847981 has 4 divisors (see below), whose sum is σ = 3980700. Its totient is φ = 3715264.

The previous prime is 3847939. The next prime is 3848017. The reversal of 3847981 is 1897483.

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

It can be written as a sum of positive squares in 2 ways, for example, as 872356 + 2975625 = 934^2 + 1725^2 .

It is a cyclic number.

It is not a de Polignac number, because 3847981 - 2⁹ = 3847469 is a prime.

It is a super-2 number, since 2×3847981² = 29613915552722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3847931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66316 + ... + 66373.

It is an arithmetic number, because the mean of its divisors is an integer number (995175).

Almost surely, 2^3847981 is an apocalyptic number.

It is an amenable number.

3847981 is a deficient number, since it is larger than the sum of its proper divisors (132719).

3847981 is a wasteful number, since it uses less digits than its factorization.

3847981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132718.

The product of its digits is 48384, while the sum is 40.

The square root of 3847981 is about 1961.6271307259. The cubic root of 3847981 is about 156.7031186243.

The spelling of 3847981 in words is "three million, eight hundred forty-seven thousand, nine hundred eighty-one".