522730 has 16 divisors (see below), whose sum is σ = 1013544. Its totient is φ = 192960.

The previous prime is 522719. The next prime is 522737. The reversal of 522730 is 37225.

It is a happy number.

522730 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 723²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 187489 + 335241 = 433^2 + 579^2 .

It is a junction number, because it is equal to n+sod(n) for n = 522698 and 522707.

It is not an unprimeable number, because it can be changed into a prime (522737) 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, 1881 + ... + 2140.

522730 is a Friedman number, since it can be written as 723^2+5^0, using all its digits and the basic arithmetic operations.

2⁵²²⁷³⁰ is an apocalyptic number.

522730 is a deficient number, since it is larger than the sum of its proper divisors (490814).

522730 is a wasteful number, since it uses less digits than its factorization.

522730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041.

The product of its (nonzero) digits is 420, while the sum is 19.

The square root of 522730 is about 723.0006915626. Note that the first 3 decimals coincide. The cubic root of 522730 is about 80.5549950197.

Adding to 522730 its reverse (37225), we get a palindrome (559955).

The spelling of 522730 in words is "five hundred twenty-two thousand, seven hundred thirty".