2028405 has 16 divisors (see below), whose sum is σ = 3358080. Its totient is φ = 1044288.

The previous prime is 2028401. The next prime is 2028413. The reversal of 2028405 is 5048202.

It is not a de Polignac number, because 2028405 - 2² = 2028401 is a prime.

It is a super-2 number, since 2×2028405² = 8228853688050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2028401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1897 + ... + 2766.

It is an arithmetic number, because the mean of its divisors is an integer number (209880).

2^2028405 is an apocalyptic number.

It is an amenable number.

2028405 is a deficient number, since it is larger than the sum of its proper divisors (1329675).

2028405 is a wasteful number, since it uses less digits than its factorization.

2028405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4700.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 2028405 is about 1424.2208396172. The cubic root of 2028405 is about 126.5857709077.

The spelling of 2028405 in words is "two million, twenty-eight thousand, four hundred five".