3977381 has 2 divisors, whose sum is σ = 3977382. Its totient is φ = 3977380.

The previous prime is 3977377. The next prime is 3977387. The reversal of 3977381 is 1837793.

It is a happy number.

3977381 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., 3865156 + 112225 = 1966^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 3977381 - 2² = 3977377 is a prime.

It is a super-2 number, since 2×3977381² = 31639119238322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3977387) 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, 1988690 + 1988691.

It is an arithmetic number, because the mean of its divisors is an integer number (1988691).

Almost surely, 2^3977381 is an apocalyptic number.

It is an amenable number.

3977381 is a deficient number, since it is larger than the sum of its proper divisors (1).

3977381 is an equidigital number, since it uses as much as digits as its factorization.

3977381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 38.

The square root of 3977381 is about 1994.3372332682. The cubic root of 3977381 is about 158.4403275589.

The spelling of 3977381 in words is "three million, nine hundred seventy-seven thousand, three hundred eighty-one".