2212409 has 4 divisors (see below), whose sum is σ = 2248740. Its totient is φ = 2176080.

The previous prime is 2212391. The next prime is 2212421. The reversal of 2212409 is 9042122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9042122 = 2 ⋅4521061.

It can be written as a sum of positive squares in 2 ways, for example, as 1155625 + 1056784 = 1075^2 + 1028^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212409 - 2⁸ = 2212153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2212429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18074 + ... + 18195.

It is an arithmetic number, because the mean of its divisors is an integer number (562185).

2^2212409 is an apocalyptic number.

It is an amenable number.

2212409 is a deficient number, since it is larger than the sum of its proper divisors (36331).

2212409 is an equidigital number, since it uses as much as digits as its factorization.

2212409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36330.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2212409 is about 1487.4168884344. The cubic root of 2212409 is about 130.3032172632.

The spelling of 2212409 in words is "two million, two hundred twelve thousand, four hundred nine".