2189278 has 32 divisors (see below), whose sum is σ = 4225536. Its totient is φ = 826848.

The previous prime is 2189273. The next prime is 2189281. The reversal of 2189278 is 8729812.

2189278 is a nontrivial binomial coefficient, being equal to C(2093, 2).

It is a super-2 number, since 2×2189278² = 9585876322568, which contains 22 as substring.

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 (2189273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3925 + ... + 4447.

It is an arithmetic number, because the mean of its divisors is an integer number (132048).

2^2189278 is an apocalyptic number.

2189278 is the 2092-nd triangular number.

2189278 is the 698-th centered nonagonal number.

2189278 is a deficient number, since it is larger than the sum of its proper divisors (2036258).

2189278 is a wasteful number, since it uses less digits than its factorization.

2189278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568.

The product of its digits is 16128, while the sum is 37.

The square root of 2189278 is about 1479.6208973923. The cubic root of 2189278 is about 129.8475135151.

The spelling of 2189278 in words is "two million, one hundred eighty-nine thousand, two hundred seventy-eight".