2908209 has 4 divisors (see below), whose sum is σ = 3877616. Its totient is φ = 1938804.

The previous prime is 2908183. The next prime is 2908261. The reversal of 2908209 is 9028092.

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.

It is not a de Polignac number, because 2908209 - 2⁵ = 2908177 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2901209) 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, 484699 + ... + 484704.

It is an arithmetic number, because the mean of its divisors is an integer number (969404).

2^2908209 is an apocalyptic number.

It is an amenable number.

2908209 is a deficient number, since it is larger than the sum of its proper divisors (969407).

2908209 is an equidigital number, since it uses as much as digits as its factorization.

2908209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969406.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 2908209 is about 1705.3471787293. The cubic root of 2908209 is about 142.7387441374.

The spelling of 2908209 in words is "two million, nine hundred eight thousand, two hundred nine".