520906 has 4 divisors (see below), whose sum is σ = 781362. Its totient is φ = 260452.

The previous prime is 520889. The next prime is 520913. The reversal of 520906 is 609025.

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

It can be written as a sum of positive squares in only one way, i.e., 502681 + 18225 = 709^2 + 135^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130225 + ... + 130228.

2⁵²⁰⁹⁰⁶ is an apocalyptic number.

520906 is a deficient number, since it is larger than the sum of its proper divisors (260456).

520906 is a wasteful number, since it uses less digits than its factorization.

520906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260455.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 520906 is about 721.7381796746. The cubic root of 520906 is about 80.4611903509.

The spelling of 520906 in words is "five hundred twenty thousand, nine hundred six".