2188878 has 16 divisors (see below), whose sum is σ = 4392576. Its totient is φ = 727160.

The previous prime is 2188877. The next prime is 2188909. The reversal of 2188878 is 8788812.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2575 + ... + 3317.

It is an arithmetic number, because the mean of its divisors is an integer number (274536).

2^2188878 is an apocalyptic number.

2188878 is an abundant number, since it is smaller than the sum of its proper divisors (2203698).

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

2188878 is a wasteful number, since it uses less digits than its factorization.

2188878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239.

The product of its digits is 57344, while the sum is 42.

The square root of 2188878 is about 1479.4857214586. The cubic root of 2188878 is about 129.8396049460.

The spelling of 2188878 in words is "two million, one hundred eighty-eight thousand, eight hundred seventy-eight".