3978893 has 2 divisors, whose sum is σ = 3978894. Its totient is φ = 3978892.

The previous prime is 3978883. The next prime is 3978899. The reversal of 3978893 is 3988793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2137444 + 1841449 = 1462^2 + 1357^2 .

It is a cyclic number.

It is not a de Polignac number, because 3978893 - 2¹² = 3974797 is a prime.

It is a Sophie Germain 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 (3978899) 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 as a sum of consecutive naturals, namely, 1989446 + 1989447.

It is an arithmetic number, because the mean of its divisors is an integer number (1989447).

Almost surely, 2^3978893 is an apocalyptic number.

It is an amenable number.

3978893 is a deficient number, since it is larger than the sum of its proper divisors (1).

3978893 is an equidigital number, since it uses as much as digits as its factorization.

3978893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 3978893 is about 1994.7162705508. The cubic root of 3978893 is about 158.4604020271.

The spelling of 3978893 in words is "three million, nine hundred seventy-eight thousand, eight hundred ninety-three".