3973391 has 2 divisors, whose sum is σ = 3973392. Its totient is φ = 3973390.

The previous prime is 3973381. The next prime is 3973421. The reversal of 3973391 is 1933793.

It is a happy number.

3973391 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 is a cyclic number.

It is not a de Polignac number, because 3973391 - 2¹⁴ = 3957007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3973331) 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, 1986695 + 1986696.

It is an arithmetic number, because the mean of its divisors is an integer number (1986696).

Almost surely, 2^3973391 is an apocalyptic number.

3973391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3973391 is an equidigital number, since it uses as much as digits as its factorization.

3973391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15309, while the sum is 35.

The square root of 3973391 is about 1993.3366499415. The cubic root of 3973391 is about 158.3873288294.

The spelling of 3973391 in words is "three million, nine hundred seventy-three thousand, three hundred ninety-one".