520736387 has 4 divisors (see below), whose sum is σ = 522672480. Its totient is φ = 518800296.

The previous prime is 520736371. The next prime is 520736393. The reversal of 520736387 is 783637025.

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 520736387 - 2⁴ = 520736371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520736317) 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, 967643 + ... + 968180.

It is an arithmetic number, because the mean of its divisors is an integer number (130668120).

Almost surely, 2^520736387 is an apocalyptic number.

520736387 is a deficient number, since it is larger than the sum of its proper divisors (1936093).

520736387 is a wasteful number, since it uses less digits than its factorization.

520736387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936092.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 520736387 is about 22819.6491427892. The cubic root of 520736387 is about 804.5245637240.

The spelling of 520736387 in words is "five hundred twenty million, seven hundred thirty-six thousand, three hundred eighty-seven".