520744839 has 8 divisors (see below), whose sum is σ = 694899072. Its totient is φ = 346876920.

The previous prime is 520744823. The next prime is 520744859. The reversal of 520744839 is 938447025.

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

It is not a de Polignac number, because 520744839 - 2⁴ = 520744823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 520744839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520744859) 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, 67297 + ... + 74634.

It is an arithmetic number, because the mean of its divisors is an integer number (86862384).

Almost surely, 2^520744839 is an apocalyptic number.

520744839 is a deficient number, since it is larger than the sum of its proper divisors (174154233).

520744839 is a wasteful number, since it uses less digits than its factorization.

520744839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143157.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 520744839 is about 22819.8343333163. The cubic root of 520744839 is about 804.5289164093.

The spelling of 520744839 in words is "five hundred twenty million, seven hundred forty-four thousand, eight hundred thirty-nine".