2189405 has 4 divisors (see below), whose sum is σ = 2627292. Its totient is φ = 1751520.

The previous prime is 2189399. The next prime is 2189417. The reversal of 2189405 is 5049812.

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 1582564 + 606841 = 1258^2 + 779^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2189405 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218936 + ... + 218945.

It is an arithmetic number, because the mean of its divisors is an integer number (656823).

2^2189405 is an apocalyptic number.

It is an amenable number.

2189405 is a deficient number, since it is larger than the sum of its proper divisors (437887).

2189405 is an equidigital number, since it uses as much as digits as its factorization.

2189405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437886.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 2189405 is about 1479.6638131684. The cubic root of 2189405 is about 129.8500242843.

The spelling of 2189405 in words is "two million, one hundred eighty-nine thousand, four hundred five".