523031240 has 96 divisors (see below), whose sum is σ = 1285875000. Its totient is φ = 191213568.

The previous prime is 523031209. The next prime is 523031251. The reversal of 523031240 is 42130325.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 404090404 + 118940836 = 20102^2 + 10906^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 418136 + ... + 419384.

Almost surely, 2^523031240 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 523031240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (642937500).

523031240 is an abundant number, since it is smaller than the sum of its proper divisors (762843760).

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

523031240 is a wasteful number, since it uses less digits than its factorization.

523031240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327 (or 1304 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 523031240 is about 22869.8762567706. The cubic root of 523031240 is about 805.7046618499.

Adding to 523031240 its reverse (42130325), we get a palindrome (565161565).

The spelling of 523031240 in words is "five hundred twenty-three million, thirty-one thousand, two hundred forty".