2639189 has 6 divisors (see below), whose sum is σ = 3070134. Its totient is φ = 2262120.

The previous prime is 2639183. The next prime is 2639201. The reversal of 2639189 is 9819362.

It can be written as a sum of positive squares in only one way, i.e., 2592100 + 47089 = 1610^2 + 217^2 .

It is not a de Polignac number, because 2639189 - 2¹⁶ = 2573653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639183) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26882 + ... + 26979.

It is an arithmetic number, because the mean of its divisors is an integer number (511689).

2^2639189 is an apocalyptic number.

It is an amenable number.

2639189 is a deficient number, since it is larger than the sum of its proper divisors (430945).

2639189 is an equidigital number, since it uses as much as digits as its factorization.

2639189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53875 (or 53868 counting only the distinct ones).

The product of its digits is 23328, while the sum is 38.

The square root of 2639189 is about 1624.5580937597. The cubic root of 2639189 is about 138.1943107436.

The spelling of 2639189 in words is "two million, six hundred thirty-nine thousand, one hundred eighty-nine".