2405905 has 4 divisors (see below), whose sum is σ = 2887092. Its totient is φ = 1924720.

The previous prime is 2405881. The next prime is 2405917. The reversal of 2405905 is 5095042.

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 242064 + 2163841 = 492^2 + 1471^2 .

It is not a de Polignac number, because 2405905 - 2⁵ = 2405873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2405905.

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, 240586 + ... + 240595.

It is an arithmetic number, because the mean of its divisors is an integer number (721773).

2^2405905 is an apocalyptic number.

It is an amenable number.

2405905 is a deficient number, since it is larger than the sum of its proper divisors (481187).

2405905 is an equidigital number, since it uses as much as digits as its factorization.

2405905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481186.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2405905 is about 1551.0979981935. The cubic root of 2405905 is about 133.9963056827.

The spelling of 2405905 in words is "two million, four hundred five thousand, nine hundred five".