2585405 has 4 divisors (see below), whose sum is σ = 3102492. Its totient is φ = 2068320.

The previous prime is 2585399. The next prime is 2585413. The reversal of 2585405 is 5045852.

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 1684804 + 900601 = 1298^2 + 949^2 .

It is not a de Polignac number, because 2585405 - 2⁴ = 2585389 is a prime.

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, 258536 + ... + 258545.

It is an arithmetic number, because the mean of its divisors is an integer number (775623).

2^2585405 is an apocalyptic number.

It is an amenable number.

2585405 is a deficient number, since it is larger than the sum of its proper divisors (517087).

2585405 is an equidigital number, since it uses as much as digits as its factorization.

2585405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517086.

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 2585405 is about 1607.9194631573. The cubic root of 2585405 is about 137.2491072190.

The spelling of 2585405 in words is "two million, five hundred eighty-five thousand, four hundred five".