3429821 has 2 divisors, whose sum is σ = 3429822. Its totient is φ = 3429820.

The previous prime is 3429799. The next prime is 3429857. The reversal of 3429821 is 1289243.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2992900 + 436921 = 1730^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 3429821 - 2⁶ = 3429757 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3429721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1714910 + 1714911.

It is an arithmetic number, because the mean of its divisors is an integer number (1714911).

Almost surely, 2^3429821 is an apocalyptic number.

It is an amenable number.

3429821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3429821 is an equidigital number, since it uses as much as digits as its factorization.

3429821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 29.

The square root of 3429821 is about 1851.9775916571. The cubic root of 3429821 is about 150.8078048293.

The spelling of 3429821 in words is "three million, four hundred twenty-nine thousand, eight hundred twenty-one".