491804018 has 16 divisors (see below), whose sum is σ = 778705440. Its totient is φ = 232953300.

The previous prime is 491804003. The next prime is 491804039. The reversal of 491804018 is 810408194.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4208 + ... + 31643.

It is an arithmetic number, because the mean of its divisors is an integer number (48669090).

Almost surely, 2^491804018 is an apocalyptic number.

491804018 is a deficient number, since it is larger than the sum of its proper divisors (286901422).

491804018 is an equidigital number, since it uses as much as digits as its factorization.

491804018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35910 (or 35872 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 491804018 is about 22176.6547973314. The cubic root of 491804018 is about 789.3398415959.

The spelling of 491804018 in words is "four hundred ninety-one million, eight hundred four thousand, eighteen".