2189879306 has 4 divisors (see below), whose sum is σ = 3284818962. Its totient is φ = 1094939652.

The previous prime is 2189879269. The next prime is 2189879309. The reversal of 2189879306 is 6039789812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2067975625 + 121903681 = 45475^2 + 11041^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2189879309) 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, 547469825 + ... + 547469828.

Almost surely, 2^2189879306 is an apocalyptic number.

2189879306 is a deficient number, since it is larger than the sum of its proper divisors (1094939656).

2189879306 is a wasteful number, since it uses less digits than its factorization.

2189879306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094939655.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The square root of 2189879306 is about 46796.1462729571. The cubic root of 2189879306 is about 1298.5940037792.

The spelling of 2189879306 in words is "two billion, one hundred eighty-nine million, eight hundred seventy-nine thousand, three hundred six".