520406 has 8 divisors (see below), whose sum is σ = 783840. Its totient is φ = 259128.

The previous prime is 520393. The next prime is 520409. The reversal of 520406 is 604025.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520409) by changing a digit.

520406 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380 + ... + 1088.

It is an arithmetic number, because the mean of its divisors is an integer number (97980).

2⁵²⁰⁴⁰⁶ is an apocalyptic number.

520406 is a deficient number, since it is larger than the sum of its proper divisors (263434).

520406 is a wasteful number, since it uses less digits than its factorization.

520406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 520406 is about 721.3917105152. The cubic root of 520406 is about 80.4354381204.

The spelling of 520406 in words is "five hundred twenty thousand, four hundred six".