3426721 has 2 divisors, whose sum is σ = 3426722. Its totient is φ = 3426720.

The previous prime is 3426697. The next prime is 3426733. The reversal of 3426721 is 1276243.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3294225 + 132496 = 1815^2 + 364^2 .

It is an emirp because it is prime and its reverse (1276243) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3426721 - 2¹⁹ = 2902433 is a prime.

It is not a weakly prime, because it can be changed into another prime (3426121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1713360 + 1713361.

It is an arithmetic number, because the mean of its divisors is an integer number (1713361).

Almost surely, 2^3426721 is an apocalyptic number.

It is an amenable number.

3426721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3426721 is an equidigital number, since it uses as much as digits as its factorization.

3426721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 25.

The square root of 3426721 is about 1851.1404592845. The cubic root of 3426721 is about 150.7623558963.

The spelling of 3426721 in words is "three million, four hundred twenty-six thousand, seven hundred twenty-one".