2209845 has 32 divisors (see below), whose sum is σ = 3939840. Its totient is φ = 1048640.

The previous prime is 2209843. The next prime is 2209849. The reversal of 2209845 is 5489022.

It is not a de Polignac number, because 2209845 - 2¹ = 2209843 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2209841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9622 + ... + 9848.

It is an arithmetic number, because the mean of its divisors is an integer number (123120).

2^2209845 is an apocalyptic number.

It is an amenable number.

2209845 is a deficient number, since it is larger than the sum of its proper divisors (1729995).

2209845 is a wasteful number, since it uses less digits than its factorization.

2209845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 2209845 is about 1486.5547416762. The cubic root of 2209845 is about 130.2528609026.

The spelling of 2209845 in words is "two million, two hundred nine thousand, eight hundred forty-five".