520393809 has 8 divisors (see below), whose sum is σ = 747232192. Its totient is φ = 320242320.

The previous prime is 520393787. The next prime is 520393873. The reversal of 520393809 is 908393025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 520393809 - 2⁸ = 520393553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 13343431 = 520393809 / (5 + 2 + 0 + 3 + 9 + 3 + 8 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520393879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6671677 + ... + 6671754.

It is an arithmetic number, because the mean of its divisors is an integer number (93404024).

Almost surely, 2^520393809 is an apocalyptic number.

It is an amenable number.

520393809 is a deficient number, since it is larger than the sum of its proper divisors (226838383).

520393809 is a wasteful number, since it uses less digits than its factorization.

520393809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13343447.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 520393809 is about 22812.1417012958. The cubic root of 520393809 is about 804.3481002361.

The spelling of 520393809 in words is "five hundred twenty million, three hundred ninety-three thousand, eight hundred nine".