3457721 has 2 divisors, whose sum is σ = 3457722. Its totient is φ = 3457720.

The previous prime is 3457703. The next prime is 3457723. The reversal of 3457721 is 1277543.

3457721 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., 2325625 + 1132096 = 1525^2 + 1064^2 .

It is an emirp because it is prime and its reverse (1277543) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3457721 is a prime.

Together with 3457723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3457723) 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, 1728860 + 1728861.

It is an arithmetic number, because the mean of its divisors is an integer number (1728861).

Almost surely, 2^3457721 is an apocalyptic number.

It is an amenable number.

3457721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3457721 is an equidigital number, since it uses as much as digits as its factorization.

3457721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880, while the sum is 29.

The square root of 3457721 is about 1859.4948238702. The cubic root of 3457721 is about 151.2156181668.

The spelling of 3457721 in words is "three million, four hundred fifty-seven thousand, seven hundred twenty-one".