518490493 has 4 divisors (see below), whose sum is σ = 525793248. Its totient is φ = 511187740.

The previous prime is 518490491. The next prime is 518490499. The reversal of 518490493 is 394094815.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 394094815 = 5 ⋅78818963.

It is a cyclic number.

It is not a de Polignac number, because 518490493 - 2¹ = 518490491 is a prime.

It is a super-3 number, since 3×518490493³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518490491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3651271 + ... + 3651412.

It is an arithmetic number, because the mean of its divisors is an integer number (131448312).

Almost surely, 2^518490493 is an apocalyptic number.

It is an amenable number.

518490493 is a deficient number, since it is larger than the sum of its proper divisors (7302755).

518490493 is an equidigital number, since it uses as much as digits as its factorization.

518490493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7302754.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 518490493 is about 22770.3863164418. The cubic root of 518490493 is about 803.3662804314.

The spelling of 518490493 in words is "five hundred eighteen million, four hundred ninety thousand, four hundred ninety-three".