520139 has 4 divisors (see below), whose sum is σ = 524856. Its totient is φ = 515424.

The previous prime is 520129. The next prime is 520151. The reversal of 520139 is 931025.

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 520139 - 2⁴ = 520123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520139.

It is not an unprimeable number, because it can be changed into a prime (520129) 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, 2189 + ... + 2414.

It is an arithmetic number, because the mean of its divisors is an integer number (131214).

2⁵²⁰¹³⁹ is an apocalyptic number.

520139 is a deficient number, since it is larger than the sum of its proper divisors (4717).

520139 is a wasteful number, since it uses less digits than its factorization.

520139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4716.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 520139 is about 721.2066278120. The cubic root of 520139 is about 80.4216796729.

The spelling of 520139 in words is "five hundred twenty thousand, one hundred thirty-nine".