518023140 has 24 divisors (see below), whose sum is σ = 1450464960. Its totient is φ = 138139488.

The previous prime is 518023117. The next prime is 518023141. The reversal of 518023140 is 41320815.

It is a self number, because there is not a number n which added to its sum of digits gives 518023140.

It is not an unprimeable number, because it can be changed into a prime (518023141) 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, 4316800 + ... + 4316919.

It is an arithmetic number, because the mean of its divisors is an integer number (60436040).

Almost surely, 2^518023140 is an apocalyptic number.

It is an amenable number.

518023140 is an abundant number, since it is smaller than the sum of its proper divisors (932441820).

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

518023140 is a wasteful number, since it uses less digits than its factorization.

518023140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8633731 (or 8633729 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 518023140 is about 22760.1217044198. The cubic root of 518023140 is about 803.1248304844.

Adding to 518023140 its reverse (41320815), we get a palindrome (559343955).

The spelling of 518023140 in words is "five hundred eighteen million, twenty-three thousand, one hundred forty".