2209878 has 24 divisors (see below), whose sum is σ = 5223816. Its totient is φ = 669600.

The previous prime is 2209853. The next prime is 2209891. The reversal of 2209878 is 8789022.

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, 5383 + ... + 5778.

It is an arithmetic number, because the mean of its divisors is an integer number (217659).

2^2209878 is an apocalyptic number.

2209878 is an abundant number, since it is smaller than the sum of its proper divisors (3013938).

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

2209878 is a wasteful number, since it uses less digits than its factorization.

2209878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11180 (or 11177 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 2209878 is about 1486.5658411251. The cubic root of 2209878 is about 130.2535092623.

The spelling of 2209878 in words is "two million, two hundred nine thousand, eight hundred seventy-eight".