2628209 has 4 divisors (see below), whose sum is σ = 2667504. Its totient is φ = 2588916.

The previous prime is 2628191. The next prime is 2628229. The reversal of 2628209 is 9028262.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9028262 = 2 ⋅4514131.

It is a cyclic number.

It is not a de Polignac number, because 2628209 - 2⁸ = 2627953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2628229) 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, 19547 + ... + 19680.

It is an arithmetic number, because the mean of its divisors is an integer number (666876).

2^2628209 is an apocalyptic number.

It is an amenable number.

2628209 is a deficient number, since it is larger than the sum of its proper divisors (39295).

2628209 is an equidigital number, since it uses as much as digits as its factorization.

2628209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39294.

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

The square root of 2628209 is about 1621.1751910266. The cubic root of 2628209 is about 138.0023979139.

The spelling of 2628209 in words is "two million, six hundred twenty-eight thousand, two hundred nine".