491938560 has 108 divisors (see below), whose sum is σ = 1702096032. Its totient is φ = 131180544.

The previous prime is 491938543. The next prime is 491938561. The reversal of 491938560 is 65839194.

It is a happy number.

491938560 is a `hidden beast` number, since 49 + 19 + 38 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (491938561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9832 + ... + 32871.

Almost surely, 2^491938560 is an apocalyptic number.

491938560 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

491938560 is an abundant number, since it is smaller than the sum of its proper divisors (1210157472).

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

491938560 is a wasteful number, since it uses less digits than its factorization.

491938560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42730 (or 42713 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 491938560 is about 22179.6880050194. The cubic root of 491938560 is about 789.4118144919.

The spelling of 491938560 in words is "four hundred ninety-one million, nine hundred thirty-eight thousand, five hundred sixty".