518785380 has 36 divisors (see below), whose sum is σ = 1573649532. Its totient is φ = 138342720.

The previous prime is 518785363. The next prime is 518785381. The reversal of 518785380 is 83587815.

It is a happy number.

518785380 is a `hidden beast` number, since 518 + 7 + 8 + 53 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 191102976 + 327682404 = 13824^2 + 18102^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (518785381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1440891 + ... + 1441250.

It is an arithmetic number, because the mean of its divisors is an integer number (43712487).

Almost surely, 2^518785380 is an apocalyptic number.

It is an amenable number.

518785380 is an abundant number, since it is smaller than the sum of its proper divisors (1054864152).

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

518785380 is a wasteful number, since it uses less digits than its factorization.

518785380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2882156 (or 2882151 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The square root of 518785380 is about 22776.8606265218. The cubic root of 518785380 is about 803.5185541167.

It can be divided in two parts, 5 and 18785380, that added together give a triangular number (18785385 = T₆₁₂₉).

The spelling of 518785380 in words is "five hundred eighteen million, seven hundred eighty-five thousand, three hundred eighty".