2642209 has 4 divisors (see below), whose sum is σ = 2692116. Its totient is φ = 2592304.

The previous prime is 2642203. The next prime is 2642231. The reversal of 2642209 is 9022462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9022462 = 2 ⋅4511231.

It can be written as a sum of positive squares in 2 ways, for example, as 1134225 + 1507984 = 1065^2 + 1228^2 .

It is a cyclic number.

It is not a de Polignac number, because 2642209 - 2³ = 2642201 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 6⁴ + 4⁶ + 2¹³ + 2²¹ + 0 + 9⁶ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2642201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24874 + ... + 24979.

It is an arithmetic number, because the mean of its divisors is an integer number (673029).

2^2642209 is an apocalyptic number.

It is an amenable number.

2642209 is a deficient number, since it is larger than the sum of its proper divisors (49907).

2642209 is an equidigital number, since it uses as much as digits as its factorization.

2642209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49906.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 2642209 is about 1625.4873115469. The cubic root of 2642209 is about 138.2470021488.

The spelling of 2642209 in words is "two million, six hundred forty-two thousand, two hundred nine".