2189545 has 4 divisors (see below), whose sum is σ = 2627460. Its totient is φ = 1751632.

The previous prime is 2189543. The next prime is 2189563. The reversal of 2189545 is 5459812.

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 331776 + 1857769 = 576^2 + 1363^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189545 - 2¹ = 2189543 is a prime.

2189545 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2189545.

It is not an unprimeable number, because it can be changed into a prime (2189543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218950 + ... + 218959.

It is an arithmetic number, because the mean of its divisors is an integer number (656865).

2^2189545 is an apocalyptic number.

It is an amenable number.

2189545 is a deficient number, since it is larger than the sum of its proper divisors (437915).

2189545 is an equidigital number, since it uses as much as digits as its factorization.

2189545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437914.

The product of its digits is 14400, while the sum is 34.

The square root of 2189545 is about 1479.7111204556. The cubic root of 2189545 is about 129.8527919489.

The spelling of 2189545 in words is "two million, one hundred eighty-nine thousand, five hundred forty-five".