2656209 has 4 divisors (see below), whose sum is σ = 3541616. Its totient is φ = 1770804.

The previous prime is 2656207. The next prime is 2656211. The reversal of 2656209 is 9026562.

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 an interprime number because it is at equal distance from previous prime (2656207) and next prime (2656211).

It is not a de Polignac number, because 2656209 - 2¹ = 2656207 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 (2656207) 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, 442699 + ... + 442704.

It is an arithmetic number, because the mean of its divisors is an integer number (885404).

2^2656209 is an apocalyptic number.

It is an amenable number.

2656209 is a deficient number, since it is larger than the sum of its proper divisors (885407).

2656209 is an equidigital number, since it uses as much as digits as its factorization.

2656209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885406.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 2656209 is about 1629.7880230263. The cubic root of 2656209 is about 138.4907438631.

The spelling of 2656209 in words is "two million, six hundred fifty-six thousand, two hundred nine".