518640073 has 4 divisors (see below), whose sum is σ = 592731520. Its totient is φ = 444548628.

The previous prime is 518640053. The next prime is 518640077. The reversal of 518640073 is 370046815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 518640073 - 2²¹ = 516542921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (518640077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37045713 + ... + 37045726.

It is an arithmetic number, because the mean of its divisors is an integer number (148182880).

Almost surely, 2^518640073 is an apocalyptic number.

It is an amenable number.

518640073 is a deficient number, since it is larger than the sum of its proper divisors (74091447).

518640073 is an equidigital number, since it uses as much as digits as its factorization.

518640073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74091446.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 518640073 is about 22773.6706088413. The cubic root of 518640073 is about 803.4435277329.

Adding to 518640073 its reverse (370046815), we get a palindrome (888686888).

The spelling of 518640073 in words is "five hundred eighteen million, six hundred forty thousand, seventy-three".