2065405 has 4 divisors (see below), whose sum is σ = 2478492. Its totient is φ = 1652320.

The previous prime is 2065397. The next prime is 2065411. The reversal of 2065405 is 5045602.

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 1490841 + 574564 = 1221^2 + 758^2 .

It is not a de Polignac number, because 2065405 - 2³ = 2065397 is a prime.

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 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, 206536 + ... + 206545.

It is an arithmetic number, because the mean of its divisors is an integer number (619623).

2^2065405 is an apocalyptic number.

It is an amenable number.

2065405 is a deficient number, since it is larger than the sum of its proper divisors (413087).

2065405 is an equidigital number, since it uses as much as digits as its factorization.

2065405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413086.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 2065405 is about 1437.1516969339. The cubic root of 2065405 is about 127.3508187264.

The spelling of 2065405 in words is "two million, sixty-five thousand, four hundred five".