491858430 has 64 divisors (see below), whose sum is σ = 1354268160. Its totient is φ = 111993984.

The previous prime is 491858417. The next prime is 491858459. The reversal of 491858430 is 34858194.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 31 ways as a sum of consecutive naturals, for example, 52137 + ... + 60843.

It is an arithmetic number, because the mean of its divisors is an integer number (21160440).

Almost surely, 2^491858430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491858430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (677134080).

491858430 is an abundant number, since it is smaller than the sum of its proper divisors (862409730).

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

491858430 is a wasteful number, since it uses less digits than its factorization.

491858430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8993.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 491858430 is about 22177.8815489668. The cubic root of 491858430 is about 789.3689507357.

The spelling of 491858430 in words is "four hundred ninety-one million, eight hundred fifty-eight thousand, four hundred thirty".