2189668 has 24 divisors (see below), whose sum is σ = 4371192. Its totient is φ = 950784.

The previous prime is 2189647. The next prime is 2189699. The reversal of 2189668 is 8669812.

It can be written as a sum of positive squares in 4 ways, for example, as 252004 + 1937664 = 502^2 + 1392^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2189668.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355 + ... + 2122.

It is an arithmetic number, because the mean of its divisors is an integer number (182133).

2^2189668 is an apocalyptic number.

It is an amenable number.

2189668 is a deficient number, since it is larger than the sum of its proper divisors (2181524).

2189668 is a wasteful number, since it uses less digits than its factorization.

2189668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2511 (or 2509 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 2189668 is about 1479.7526820385. The cubic root of 2189668 is about 129.8552234425.

The spelling of 2189668 in words is "two million, one hundred eighty-nine thousand, six hundred sixty-eight".