518578042 has 4 divisors (see below), whose sum is σ = 777867066. Its totient is φ = 259289020.

The previous prime is 518578037. The next prime is 518578043. The reversal of 518578042 is 240875815.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 484484121 + 34093921 = 22011^2 + 5839^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 518577986 and 518578004.

It is not an unprimeable number, because it can be changed into a prime (518578043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129644509 + ... + 129644512.

Almost surely, 2^518578042 is an apocalyptic number.

518578042 is a deficient number, since it is larger than the sum of its proper divisors (259289024).

518578042 is a wasteful number, since it uses less digits than its factorization.

518578042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259289023.

The product of its (nonzero) digits is 89600, while the sum is 40.

The square root of 518578042 is about 22772.3086664484. The cubic root of 518578042 is about 803.4114949899.

The spelling of 518578042 in words is "five hundred eighteen million, five hundred seventy-eight thousand, forty-two".