2189812 has 6 divisors (see below), whose sum is σ = 3832178. Its totient is φ = 1094904.

The previous prime is 2189797. The next prime is 2189813.

It is a happy number.

2189812 is nontrivially palindromic in base 10.

2189812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2178576 + 11236 = 1476^2 + 106^2 .

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

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 273723 + ... + 273730.

2^2189812 is an apocalyptic number.

It is an amenable number.

2189812 is a deficient number, since it is larger than the sum of its proper divisors (1642366).

2189812 is a wasteful number, since it uses less digits than its factorization.

2189812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547457 (or 547455 counting only the distinct ones).

The product of its digits is 2304, while the sum is 31.

The square root of 2189812 is about 1479.8013380180. The cubic root of 2189812 is about 129.8580699536.

The spelling of 2189812 in words is "two million, one hundred eighty-nine thousand, eight hundred twelve".