523720 has 16 divisors (see below), whose sum is σ = 1178460. Its totient is φ = 209472.

The previous prime is 523717. The next prime is 523729. The reversal of 523720 is 27325.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 509796 + 13924 = 714^2 + 118^2 .

It is not an unprimeable number, because it can be changed into a prime (523729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6507 + ... + 6586.

2⁵²³⁷²⁰ is an apocalyptic number.

It is an amenable number.

523720 is an abundant number, since it is smaller than the sum of its proper divisors (654740).

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

523720 is a wasteful number, since it uses less digits than its factorization.

523720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13104 (or 13100 counting only the distinct ones).

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

The square root of 523720 is about 723.6850143536. The cubic root of 523720 is about 80.6058174022.

The spelling of 523720 in words is "five hundred twenty-three thousand, seven hundred twenty".