491394140 has 12 divisors (see below), whose sum is σ = 1031927736. Its totient is φ = 196557648.

The previous prime is 491394139. The next prime is 491394161. The reversal of 491394140 is 41493194.

It is a self number, because there is not a number n which added to its sum of digits gives 491394140.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12284834 + ... + 12284873.

It is an arithmetic number, because the mean of its divisors is an integer number (85993978).

Almost surely, 2^491394140 is an apocalyptic number.

It is an amenable number.

491394140 is an abundant number, since it is smaller than the sum of its proper divisors (540533596).

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

491394140 is a wasteful number, since it uses less digits than its factorization.

491394140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24569716 (or 24569714 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 491394140 is about 22167.4116666786. The cubic root of 491394140 is about 789.1204974773.

The spelling of 491394140 in words is "four hundred ninety-one million, three hundred ninety-four thousand, one hundred forty".