3827981 has 2 divisors, whose sum is σ = 3827982. Its totient is φ = 3827980.

The previous prime is 3827977. The next prime is 3828007. The reversal of 3827981 is 1897283.

3827981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3455881 + 372100 = 1859^2 + 610^2 .

It is a cyclic number.

It is not a de Polignac number, because 3827981 - 2² = 3827977 is a prime.

It is a super-2 number, since 2×3827981² = 29306877072722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3827381) 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 as a sum of consecutive naturals, namely, 1913990 + 1913991.

It is an arithmetic number, because the mean of its divisors is an integer number (1913991).

Almost surely, 2^3827981 is an apocalyptic number.

It is an amenable number.

3827981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3827981 is an equidigital number, since it uses as much as digits as its factorization.

3827981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 3827981 is about 1956.5226806761. The cubic root of 3827981 is about 156.4311571375.

The spelling of 3827981 in words is "three million, eight hundred twenty-seven thousand, nine hundred eighty-one".