2505209 has 8 divisors (see below), whose sum is σ = 2910528. Its totient is φ = 2111760.

The previous prime is 2505193. The next prime is 2505227. The reversal of 2505209 is 9025052.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2505209 - 2⁴ = 2505193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2505259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2507 + ... + 3360.

It is an arithmetic number, because the mean of its divisors is an integer number (363816).

2^2505209 is an apocalyptic number.

It is an amenable number.

2505209 is a deficient number, since it is larger than the sum of its proper divisors (405319).

2505209 is an equidigital number, since it uses as much as digits as its factorization.

2505209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5935.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 2505209 is about 1582.7852033678. The cubic root of 2505209 is about 135.8150781126.

The spelling of 2505209 in words is "two million, five hundred five thousand, two hundred nine".