523740 has 96 divisors (see below), whose sum is σ = 1774080. Its totient is φ = 112896.

The previous prime is 523729. The next prime is 523741. The reversal of 523740 is 47325.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523741) by changing a digit.

523740 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 31 ways as a sum of consecutive naturals, for example, 12159 + ... + 12201.

It is an arithmetic number, because the mean of its divisors is an integer number (18480).

2⁵²³⁷⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 523740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (887040).

523740 is an abundant number, since it is smaller than the sum of its proper divisors (1250340).

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

523740 is a wasteful number, since it uses less digits than its factorization.

523740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 523740 is about 723.6988323882. The cubic root of 523740 is about 80.6068434567.

The spelling of 523740 in words is "five hundred twenty-three thousand, seven hundred forty".