2520805 has 12 divisors (see below), whose sum is σ = 3519180. Its totient is φ = 1728384.

The previous prime is 2520797. The next prime is 2520821. The reversal of 2520805 is 5080252.

It can be written as a sum of positive squares in 2 ways, for example, as 1640961 + 879844 = 1281^2 + 938^2 .

It is not a de Polignac number, because 2520805 - 2³ = 2520797 is a prime.

2520805 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4900 + ... + 5389.

It is an arithmetic number, because the mean of its divisors is an integer number (293265).

2^2520805 is an apocalyptic number.

It is an amenable number.

2520805 is a deficient number, since it is larger than the sum of its proper divisors (998375).

2520805 is a wasteful number, since it uses less digits than its factorization.

2520805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10308 (or 10301 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 2520805 is about 1587.7043175604. The cubic root of 2520805 is about 136.0963309726.

The spelling of 2520805 in words is "two million, five hundred twenty thousand, eight hundred five".