523115440 has 40 divisors (see below), whose sum is σ = 1217587248. Its totient is φ = 209015040.

The previous prime is 523115419. The next prime is 523115441. The reversal of 523115440 is 44511325.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (523115441) 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, 81799 + ... + 87961.

Almost surely, 2^523115440 is an apocalyptic number.

It is an amenable number.

523115440 is an abundant number, since it is smaller than the sum of its proper divisors (694471808).

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

523115440 is a wasteful number, since it uses less digits than its factorization.

523115440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7237 (or 7231 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 523115440 is about 22871.7170321775. The cubic root of 523115440 is about 805.7478948905.

Adding to 523115440 its reverse (44511325), we get a palindrome (567626765).

The spelling of 523115440 in words is "five hundred twenty-three million, one hundred fifteen thousand, four hundred forty".