2124805 has 4 divisors (see below), whose sum is σ = 2549772. Its totient is φ = 1699840.

The previous prime is 2124797. The next prime is 2124821. The reversal of 2124805 is 5084212.

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 272484 + 1852321 = 522^2 + 1361^2 .

It is not a de Polignac number, because 2124805 - 2³ = 2124797 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212476 + ... + 212485.

It is an arithmetic number, because the mean of its divisors is an integer number (637443).

2^2124805 is an apocalyptic number.

It is an amenable number.

2124805 is a deficient number, since it is larger than the sum of its proper divisors (424967).

2124805 is an equidigital number, since it uses as much as digits as its factorization.

2124805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424966.

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

The square root of 2124805 is about 1457.6710877286. The cubic root of 2124805 is about 128.5601468643.

The spelling of 2124805 in words is "two million, one hundred twenty-four thousand, eight hundred five".