2187289 has 4 divisors (see below), whose sum is σ = 2355556. Its totient is φ = 2019024.

The previous prime is 2187287. The next prime is 2187293. The reversal of 2187289 is 9827812.

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

It can be written as a sum of positive squares in 2 ways, for example, as 444889 + 1742400 = 667^2 + 1320^2 .

It is a cyclic number.

It is not a de Polignac number, because 2187289 - 2¹ = 2187287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2187287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84114 + ... + 84139.

It is an arithmetic number, because the mean of its divisors is an integer number (588889).

2^2187289 is an apocalyptic number.

It is an amenable number.

2187289 is a deficient number, since it is larger than the sum of its proper divisors (168267).

2187289 is a wasteful number, since it uses less digits than its factorization.

2187289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168266.

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

The square root of 2187289 is about 1478.9486130356. The cubic root of 2187289 is about 129.8081786359.

The spelling of 2187289 in words is "two million, one hundred eighty-seven thousand, two hundred eighty-nine".