518642 has 4 divisors (see below), whose sum is σ = 777966. Its totient is φ = 259320.

The previous prime is 518621. The next prime is 518657. The reversal of 518642 is 246815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246815 = 5 ⋅49363.

It can be written as a sum of positive squares in only one way, i.e., 516961 + 1681 = 719^2 + 41^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 518642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129659 + ... + 129662.

2⁵¹⁸⁶⁴² is an apocalyptic number.

518642 is a deficient number, since it is larger than the sum of its proper divisors (259324).

518642 is a wasteful number, since it uses less digits than its factorization.

518642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259323.

The product of its digits is 1920, while the sum is 26.

The square root of 518642 is about 720.1680359472. The cubic root of 518642 is about 80.3444522793.

The spelling of 518642 in words is "five hundred eighteen thousand, six hundred forty-two".