493509818 has 8 divisors (see below), whose sum is σ = 754232148. Its totient is φ = 242099104.

The previous prime is 493509803. The next prime is 493509859. The reversal of 493509818 is 818905394.

It can be written as a sum of positive squares in 2 ways, for example, as 406143409 + 87366409 = 20153^2 + 9347^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 2327771 + ... + 2327982.

Almost surely, 2^493509818 is an apocalyptic number.

493509818 is a deficient number, since it is larger than the sum of its proper divisors (260722330).

493509818 is a wasteful number, since it uses less digits than its factorization.

493509818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4655808.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 493509818 is about 22215.0808686352. The cubic root of 493509818 is about 790.2513850415.

The spelling of 493509818 in words is "four hundred ninety-three million, five hundred nine thousand, eight hundred eighteen".