523521240 has 128 divisors (see below), whose sum is σ = 1722816000. Its totient is φ = 126213120.

The previous prime is 523521217. The next prime is 523521287. The reversal of 523521240 is 42125325.

523521240 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×523521240² = 548148977462275200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 523521240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 261684 + ... + 263676.

It is an arithmetic number, because the mean of its divisors is an integer number (13459500).

Almost surely, 2^523521240 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 523521240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (861408000).

523521240 is an abundant number, since it is smaller than the sum of its proper divisors (1199294760).

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

523521240 is a wasteful number, since it uses less digits than its factorization.

523521240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217 (or 2213 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 523521240 is about 22880.5865309437. The cubic root of 523521240 is about 805.9561905227.

Adding to 523521240 its reverse (42125325), we get a palindrome (565646565).

The spelling of 523521240 in words is "five hundred twenty-three million, five hundred twenty-one thousand, two hundred forty".