2028505 has 4 divisors (see below), whose sum is σ = 2434212. Its totient is φ = 1622800.

The previous prime is 2028503. The next prime is 2028511. The reversal of 2028505 is 5058202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5058202 = 2 ⋅2529101.

It can be written as a sum of positive squares in 2 ways, for example, as 767376 + 1261129 = 876^2 + 1123^2 .

It is not a de Polignac number, because 2028505 - 2¹ = 2028503 is a prime.

It is a super-2 number, since 2×2028505² = 8229665070050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2028503) 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, 202846 + ... + 202855.

It is an arithmetic number, because the mean of its divisors is an integer number (608553).

2^2028505 is an apocalyptic number.

It is an amenable number.

2028505 is a deficient number, since it is larger than the sum of its proper divisors (405707).

2028505 is an equidigital number, since it uses as much as digits as its factorization.

2028505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405706.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 2028505 is about 1424.2559460996. The cubic root of 2028505 is about 126.5878510920.

The spelling of 2028505 in words is "two million, twenty-eight thousand, five hundred five".