3421209 has 16 divisors (see below), whose sum is σ = 5094144. Its totient is φ = 2024400.

The previous prime is 3421193. The next prime is 3421219. The reversal of 3421209 is 9021243.

It is not a de Polignac number, because 3421209 - 2⁴ = 3421193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3421219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214 + ... + 2624.

It is an arithmetic number, because the mean of its divisors is an integer number (318384).

Almost surely, 2^3421209 is an apocalyptic number.

It is an amenable number.

3421209 is a deficient number, since it is larger than the sum of its proper divisors (1672935).

3421209 is a wasteful number, since it uses less digits than its factorization.

3421209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 3421209 is about 1849.6510481710. The cubic root of 3421209 is about 150.6814770163.

It can be divided in two parts, 342 and 1209, that added together give a palindrome (1551).

The spelling of 3421209 in words is "three million, four hundred twenty-one thousand, two hundred nine".