491938812 has 48 divisors (see below), whose sum is σ = 1330855680. Its totient is φ = 156849264.

The previous prime is 491938807. The next prime is 491938841. The reversal of 491938812 is 218839194.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 96538 + ... + 101505.

It is an arithmetic number, because the mean of its divisors is an integer number (27726160).

Almost surely, 2^491938812 is an apocalyptic number.

It is an amenable number.

491938812 is an abundant number, since it is smaller than the sum of its proper divisors (838916868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491938812 is a wasteful number, since it uses less digits than its factorization.

491938812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198079 (or 198071 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 491938812 is about 22179.6936858921. The cubic root of 491938812 is about 789.4119492863.

The spelling of 491938812 in words is "four hundred ninety-one million, nine hundred thirty-eight thousand, eight hundred twelve".