3429721 has 2 divisors, whose sum is σ = 3429722. Its totient is φ = 3429720.

The previous prime is 3429703. The next prime is 3429749. The reversal of 3429721 is 1279243.

3429721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (3429749) can be obtained adding 3429721 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3013696 + 416025 = 1736^2 + 645^2 .

It is a cyclic number.

It is not a de Polignac number, because 3429721 - 2⁵ = 3429689 is a prime.

It is a super-2 number, since 2×3429721² = 23525972275682, which contains 22 as substring.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 3429721.

It is not a weakly prime, because it can be changed into another prime (3429761) 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, 1714860 + 1714861.

It is an arithmetic number, because the mean of its divisors is an integer number (1714861).

Almost surely, 2^3429721 is an apocalyptic number.

It is an amenable number.

3429721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3429721 is an equidigital number, since it uses as much as digits as its factorization.

3429721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 28.

The square root of 3429721 is about 1851.9505932935. The cubic root of 3429721 is about 150.8063391623.

The spelling of 3429721 in words is "three million, four hundred twenty-nine thousand, seven hundred twenty-one".