520505407 has 4 divisors (see below), whose sum is σ = 537295936. Its totient is φ = 503714880.

The previous prime is 520505383. The next prime is 520505423. The reversal of 520505407 is 704505025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520505407 - 2¹⁵ = 520472639 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 (520505107) 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, 8395218 + ... + 8395279.

It is an arithmetic number, because the mean of its divisors is an integer number (134323984).

Almost surely, 2^520505407 is an apocalyptic number.

520505407 is a deficient number, since it is larger than the sum of its proper divisors (16790529).

520505407 is a wasteful number, since it uses less digits than its factorization.

520505407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16790528.

The product of its (nonzero) digits is 7000, while the sum is 28.

The square root of 520505407 is about 22814.5875921525. The cubic root of 520505407 is about 804.4055933768.

The spelling of 520505407 in words is "five hundred twenty million, five hundred five thousand, four hundred seven".