3330721 has 2 divisors, whose sum is σ = 3330722. Its totient is φ = 3330720.

The previous prime is 3330697. The next prime is 3330731. The reversal of 3330721 is 1270333.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1795600 + 1535121 = 1340^2 + 1239^2 .

It is an emirp because it is prime and its reverse (1270333) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3330721 - 2²¹ = 1233569 is a prime.

It is a super-2 number, since 2×3330721² = 22187404759682, which contains 22 as substring.

3330721 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3330731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1665360 + 1665361.

It is an arithmetic number, because the mean of its divisors is an integer number (1665361).

Almost surely, 2^3330721 is an apocalyptic number.

It is an amenable number.

3330721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3330721 is an equidigital number, since it uses as much as digits as its factorization.

3330721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 19.

The square root of 3330721 is about 1825.0263011803. The cubic root of 3330721 is about 149.3411249433.

The spelling of 3330721 in words is "three million, three hundred thirty thousand, seven hundred twenty-one".