491784940 has 48 divisors (see below), whose sum is σ = 1053686592. Its totient is φ = 192761856.

The previous prime is 491784913. The next prime is 491784949. The reversal of 491784940 is 49487194.

It is a super-3 number, since 3×491784940³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (491784949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242812 + ... + 244828.

It is an arithmetic number, because the mean of its divisors is an integer number (21951804).

Almost surely, 2^491784940 is an apocalyptic number.

It is an amenable number.

491784940 is an abundant number, since it is smaller than the sum of its proper divisors (561901652).

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

491784940 is a wasteful number, since it uses less digits than its factorization.

491784940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266 (or 2264 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 491784940 is about 22176.2246561492. The cubic root of 491784940 is about 789.3296348065.

The spelling of 491784940 in words is "four hundred ninety-one million, seven hundred eighty-four thousand, nine hundred forty".