2638189 has 6 divisors (see below), whose sum is σ = 2685930. Its totient is φ = 2591280.

The previous prime is 2638187. The next prime is 2638199. The reversal of 2638189 is 9818362.

It can be written as a sum of positive squares in 3 ways, for example, as 432964 + 2205225 = 658^2 + 1485^2 .

It is not a de Polignac number, because 2638189 - 2¹ = 2638187 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 (2638187) 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, 3367 + ... + 4075.

It is an arithmetic number, because the mean of its divisors is an integer number (447655).

2^2638189 is an apocalyptic number.

It is an amenable number.

2638189 is a deficient number, since it is larger than the sum of its proper divisors (47741).

2638189 is an frugal number, since it uses more digits than its factorization.

2638189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831 (or 770 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 2638189 is about 1624.2502885947. The cubic root of 2638189 is about 138.1768544002.

The spelling of 2638189 in words is "two million, six hundred thirty-eight thousand, one hundred eighty-nine".