491867940 has 24 divisors (see below), whose sum is σ = 1377230400. Its totient is φ = 131164768.

The previous prime is 491867933. The next prime is 491867977. The reversal of 491867940 is 49768194.

It is a self number, because there is not a number n which added to its sum of digits gives 491867940.

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, 4098840 + ... + 4098959.

It is an arithmetic number, because the mean of its divisors is an integer number (57384600).

Almost surely, 2^491867940 is an apocalyptic number.

It is an amenable number.

491867940 is an abundant number, since it is smaller than the sum of its proper divisors (885362460).

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

491867940 is a wasteful number, since it uses less digits than its factorization.

491867940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8197811 (or 8197809 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 491867940 is about 22178.0959507348. The cubic root of 491867940 is about 789.3740381415.

The spelling of 491867940 in words is "four hundred ninety-one million, eight hundred sixty-seven thousand, nine hundred forty".