2421805 has 4 divisors (see below), whose sum is σ = 2906172. Its totient is φ = 1937440.

The previous prime is 2421791. The next prime is 2421817. The reversal of 2421805 is 5081242.

2421805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 749956 + 1671849 = 866^2 + 1293^2 .

It is not a de Polignac number, because 2421805 - 2¹³ = 2413613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242176 + ... + 242185.

It is an arithmetic number, because the mean of its divisors is an integer number (726543).

2^2421805 is an apocalyptic number.

It is an amenable number.

2421805 is a deficient number, since it is larger than the sum of its proper divisors (484367).

2421805 is an equidigital number, since it uses as much as digits as its factorization.

2421805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484366.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 2421805 is about 1556.2149594449. The cubic root of 2421805 is about 134.2908400359.

The spelling of 2421805 in words is "two million, four hundred twenty-one thousand, eight hundred five".