521706 has 8 divisors (see below), whose sum is σ = 1043424. Its totient is φ = 173900.

The previous prime is 521693. The next prime is 521707. The reversal of 521706 is 607125.

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

521706 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (521707) by changing a digit.

521706 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, 43470 + ... + 43481.

It is an arithmetic number, because the mean of its divisors is an integer number (130428).

2⁵²¹⁷⁰⁶ is an apocalyptic number.

521706 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521706 is a wasteful number, since it uses less digits than its factorization.

521706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86956.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 521706 is about 722.2921846455. The cubic root of 521706 is about 80.5023596649.

The spelling of 521706 in words is "five hundred twenty-one thousand, seven hundred six".