2028905 has 4 divisors (see below), whose sum is σ = 2434692. Its totient is φ = 1623120.

The previous prime is 2028881. The next prime is 2028907. The reversal of 2028905 is 5098202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5098202 = 2 ⋅2549101.

It can be written as a sum of positive squares in 2 ways, for example, as 1132096 + 896809 = 1064^2 + 947^2 .

It is not a de Polignac number, because 2028905 - 2⁶ = 2028841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2028907) 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, 202886 + ... + 202895.

It is an arithmetic number, because the mean of its divisors is an integer number (608673).

2^2028905 is an apocalyptic number.

It is an amenable number.

2028905 is a deficient number, since it is larger than the sum of its proper divisors (405787).

2028905 is an equidigital number, since it uses as much as digits as its factorization.

2028905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405786.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 2028905 is about 1424.3963633764. The cubic root of 2028905 is about 126.5961711459.

The spelling of 2028905 in words is "two million, twenty-eight thousand, nine hundred five".