2209566 has 24 divisors (see below), whose sum is σ = 4558680. Its totient is φ = 713952.

The previous prime is 2209549. The next prime is 2209579. The reversal of 2209566 is 6659022.

It is a d-powerful number, because it can be written as 2¹⁵ + 2²¹ + 0 + 9 + 5⁷ + 6³ + 6⁴ .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8080 + ... + 8348.

It is an arithmetic number, because the mean of its divisors is an integer number (189945).

2^2209566 is an apocalyptic number.

2209566 is an abundant number, since it is smaller than the sum of its proper divisors (2349114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2209566 is a wasteful number, since it uses less digits than its factorization.

2209566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 311 counting only the distinct ones).

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

The square root of 2209566 is about 1486.4608975684. The cubic root of 2209566 is about 130.2473790585.

It can be divided in two parts, 2209 and 566, that added together give a triangular number (2775 = T₇₄).

The spelling of 2209566 in words is "two million, two hundred nine thousand, five hundred sixty-six".