3973421 has 2 divisors, whose sum is σ = 3973422. Its totient is φ = 3973420.

The previous prime is 3973391. The next prime is 3973429. The reversal of 3973421 is 1243793.

3973421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1999396 + 1974025 = 1414^2 + 1405^2 .

It is an emirp because it is prime and its reverse (1243793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3973421 is a prime.

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 (3973429) 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, 1986710 + 1986711.

It is an arithmetic number, because the mean of its divisors is an integer number (1986711).

Almost surely, 2^3973421 is an apocalyptic number.

It is an amenable number.

3973421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3973421 is an equidigital number, since it uses as much as digits as its factorization.

3973421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 29.

The square root of 3973421 is about 1993.3441749984. The cubic root of 3973421 is about 158.3877274485.

The spelling of 3973421 in words is "three million, nine hundred seventy-three thousand, four hundred twenty-one".