2189818 has 8 divisors (see below), whose sum is σ = 3361248. Its totient is φ = 1069404.

The previous prime is 2189813. The next prime is 2189843. The reversal of 2189818 is 8189812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (2189813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12646 + ... + 12817.

It is an arithmetic number, because the mean of its divisors is an integer number (420156).

2^2189818 is an apocalyptic number.

2189818 is a deficient number, since it is larger than the sum of its proper divisors (1171430).

2189818 is a wasteful number, since it uses less digits than its factorization.

2189818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25508.

The product of its digits is 9216, while the sum is 37.

The square root of 2189818 is about 1479.8033653158. The cubic root of 2189818 is about 129.8581885555.

The spelling of 2189818 in words is "two million, one hundred eighty-nine thousand, eight hundred eighteen".