518240 has 48 divisors (see below), whose sum is σ = 1270080. Its totient is φ = 199680.

The previous prime is 518239. The next prime is 518249. The reversal of 518240 is 42815.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518249) 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, 6521 + ... + 6599.

It is an arithmetic number, because the mean of its divisors is an integer number (26460).

2⁵¹⁸²⁴⁰ 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 518240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (635040).

518240 is an abundant number, since it is smaller than the sum of its proper divisors (751840).

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

518240 is a wasteful number, since it uses less digits than its factorization.

518240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 518240 is about 719.8888803142. Note that the first 5 decimals coincide. The cubic root of 518240 is about 80.3236885551.

The spelling of 518240 in words is "five hundred eighteen thousand, two hundred forty".