2209864 has 16 divisors (see below), whose sum is σ = 4387500. Its totient is φ = 1039872.

The previous prime is 2209853. The next prime is 2209891. The reversal of 2209864 is 4689022.

2209864 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2125764 + 84100 = 1458^2 + 290^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7989 + ... + 8260.

2^2209864 is an apocalyptic number.

It is an amenable number.

2209864 is a deficient number, since it is larger than the sum of its proper divisors (2177636).

2209864 is a wasteful number, since it uses less digits than its factorization.

2209864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16272 (or 16268 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 2209864 is about 1486.5611322781. The cubic root of 2209864 is about 130.2532342014.

The spelling of 2209864 in words is "two million, two hundred nine thousand, eight hundred sixty-four".