520400225 has 6 divisors (see below), whose sum is σ = 645296310. Its totient is φ = 416320160.

The previous prime is 520400201. The next prime is 520400261. The reversal of 520400225 is 522004025.

It can be written as a sum of positive squares in 3 ways, for example, as 10182481 + 510217744 = 3191^2 + 22588^2 .

It is not a de Polignac number, because 520400225 - 2⁶ = 520400161 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 520400197 and 520400206.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10407980 + ... + 10408029.

It is an arithmetic number, because the mean of its divisors is an integer number (107549385).

Almost surely, 2^520400225 is an apocalyptic number.

It is an amenable number.

520400225 is a deficient number, since it is larger than the sum of its proper divisors (124896085).

520400225 is a wasteful number, since it uses less digits than its factorization.

520400225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20816019 (or 20816014 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 520400225 is about 22812.2823277286. The cubic root of 520400225 is about 804.3514058585.

The spelling of 520400225 in words is "five hundred twenty million, four hundred thousand, two hundred twenty-five".