2188904 has 8 divisors (see below), whose sum is σ = 4104210. Its totient is φ = 1094448.

The previous prime is 2188877. The next prime is 2188909. The reversal of 2188904 is 4098812.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1684804 + 504100 = 1298^2 + 710^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (2188909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136799 + ... + 136814.

2^2188904 is an apocalyptic number.

It is an amenable number.

2188904 is a deficient number, since it is larger than the sum of its proper divisors (1915306).

2188904 is a wasteful number, since it uses less digits than its factorization.

2188904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273619 (or 273615 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 2188904 is about 1479.4945082696. The cubic root of 2188904 is about 129.8401190323.

The spelling of 2188904 in words is "two million, one hundred eighty-eight thousand, nine hundred four".