2520605 has 4 divisors (see below), whose sum is σ = 3024732. Its totient is φ = 2016480.

The previous prime is 2520601. The next prime is 2520611. The reversal of 2520605 is 5060252.

It is a happy number.

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 383161 + 2137444 = 619^2 + 1462^2 .

It is not a de Polignac number, because 2520605 - 2² = 2520601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252056 + ... + 252065.

It is an arithmetic number, because the mean of its divisors is an integer number (756183).

2^2520605 is an apocalyptic number.

It is an amenable number.

2520605 is a deficient number, since it is larger than the sum of its proper divisors (504127).

2520605 is an equidigital number, since it uses as much as digits as its factorization.

2520605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504126.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 2520605 is about 1587.6413322914. The cubic root of 2520605 is about 136.0927315951.

Adding to 2520605 its reverse (5060252), we get a palindrome (7580857).

It can be divided in two parts, 2520 and 605, that added together give a 5-th power (3125 = 5⁵).

The spelling of 2520605 in words is "two million, five hundred twenty thousand, six hundred five".