518720 has 28 divisors (see below), whose sum is σ = 1235964. Its totient is φ = 207360.

The previous prime is 518717. The next prime is 518729. The reversal of 518720 is 27815.

Added to its reverse (27815) it gives a triangular number (546535 = T₁₀₄₅).

It can be written as a sum of positive squares in 2 ways, for example, as 295936 + 222784 = 544^2 + 472^2 .

It is not an unprimeable number, because it can be changed into a prime (518729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491 + ... + 1130.

2⁵¹⁸⁷²⁰ is an apocalyptic number.

It is an amenable number.

518720 is an abundant number, since it is smaller than the sum of its proper divisors (717244).

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

518720 is a wasteful number, since it uses less digits than its factorization.

518720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638 (or 1628 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 518720 is about 720.2221879392. Note that the first 3 decimals coincide. The cubic root of 518720 is about 80.3484798186.

Adding to 518720 its reverse (27815), we get a triangular number (546535 = T₁₀₄₅).

It can be divided in two parts, 5187 and 20, that multiplied together give a triangular number (103740 = T₄₅₅).

The spelling of 518720 in words is "five hundred eighteen thousand, seven hundred twenty".