2045405 has 4 divisors (see below), whose sum is σ = 2454492. Its totient is φ = 1636320.

The previous prime is 2045377. The next prime is 2045437. The reversal of 2045405 is 5045402.

It is a happy number.

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 657721 + 1387684 = 811^2 + 1178^2 .

It is not a de Polignac number, because 2045405 - 2¹⁴ = 2029021 is a prime.

It is a super-2 number, since 2×2045405² = 8367363228050, which contains 22 as substring.

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, 204536 + ... + 204545.

It is an arithmetic number, because the mean of its divisors is an integer number (613623).

2^2045405 is an apocalyptic number.

It is an amenable number.

2045405 is a deficient number, since it is larger than the sum of its proper divisors (409087).

2045405 is an equidigital number, since it uses as much as digits as its factorization.

2045405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409086.

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 2045405 is about 1430.1765625265. The cubic root of 2045405 is about 126.9384246939.

The spelling of 2045405 in words is "two million, forty-five thousand, four hundred five".