3974257321 has 2 divisors, whose sum is σ = 3974257322. Its totient is φ = 3974257320.

The previous prime is 3974257279. The next prime is 3974257403. The reversal of 3974257321 is 1237524793.

3974257321 is digitally balanced in base 3, 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., 3426463296 + 547794025 = 58536^2 + 23405^2 .

It is an emirp because it is prime and its reverse (1237524793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3974257321 - 2²³ = 3965868713 is a prime.

It is not a weakly prime, because it can be changed into another prime (3974255321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1987128660 + 1987128661.

It is an arithmetic number, because the mean of its divisors is an integer number (1987128661).

Almost surely, 2^3974257321 is an apocalyptic number.

It is an amenable number.

3974257321 is a deficient number, since it is larger than the sum of its proper divisors (1).

3974257321 is an equidigital number, since it uses as much as digits as its factorization.

3974257321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 43.

The square root of 3974257321 is about 63041.7109618703. The cubic root of 3974257321 is about 1583.9883909007.

The spelling of 3974257321 in words is "three billion, nine hundred seventy-four million, two hundred fifty-seven thousand, three hundred twenty-one".